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Tock

Tock is a secure, open-source embedded operating system designed for low-memory and low-power microcontrollers, enabling the execution of multiple concurrent applications that are mutually distrustful through hardware-assisted isolation and the memory safety guarantees of the Rust programming language.^[1]^[2] It targets resource-constrained environments such as Internet of Things (IoT) devices and sensor networks, where traditional operating systems fail due to their overhead and lack of fault isolation.^[3] At its core, Tock features an event-driven kernel with no dynamic memory allocation, preemptive process scheduling, and compile-time enforcement of resource access via Rust's type system and modules, ensuring that application faults do not compromise the kernel or other processes.^[4] The system supports automatic low-power operation by integrating with hardware sleep states, achieving minimal energy consumption (e.g., approximately 5 μA on certain boards during idle periods), and allows for extensible third-party drivers without risking system stability.^[4] It runs on ARM Cortex-M and RISC-V architectures, providing a platform for reliable, long-term deployment in unattended embedded systems like urban sensing infrastructure.^[2]^[3] Tock originated in 2015 as a research project at the University of Michigan, led by Amit Levy, Prabal Dutta, and collaborators including Daniel B. Giffin, Bradford Campbell, Shane Leonard, Branden Ghena, and Pat Pannuto, initially aimed at facilitating secure application development for academic urban sensing applications.^[5]^[6] Over the subsequent decade, it evolved from an experimental system into a mature platform with broad adoption, including integration into production hardware securing millions of devices, and continues to advance through community contributions focused on formal verification, new hardware ports, and enhanced security features.^[5]

Introduction

Overview

Tock is a race board game for 2 to 6 players, in which participants use a standard deck of playing cards to move their colored tokens around a cross-shaped board.^[7] Unlike traditional dice-based games in its genre, Tock replaces random rolls with strategic card plays, allowing players to advance, capture, or position their tokens more deliberately. The game is particularly popular in Quebec and French-speaking regions, where it is known as jeu de tock or tuck.^[8] The primary objective is to be the first player—or team, in partnered play—to move all four of their tokens from the starting area, around the perimeter of the board, and safely into their designated home zone.^[9] The core gameplay loop involves drawing cards from the deck and playing one per turn to propel tokens forward by the card's numerical value (with face cards and aces having special functions), while landing on an opponent's token captures it, sending it back to start.^[10] Safe spaces on the board provide protection from capture, adding a layer of tactical navigation to the race.^[8] Tock evolved from ancient predecessors such as Pachisi, a cross-and-circle game originating in India with the oldest surviving evidence from the sixteenth century.^[11] This was adapted into Ludo, a 19th-century British version patented in 1891 under the name "Royal Ludo" that simplified the rules and used dice.^[12] Tock itself emerged among early French Canadian settlers in Quebec between the 17th and 19th centuries, who modified the mechanics to incorporate playing cards instead of dice, influencing later commercial games like Sorry! and Aggravation.

History

Tock's historical roots lie in the ancient Indian game of Pachisi, a cross-and-circle board race game with features dating back to the third millennium B.C.^[13] This game, often played by royalty and referenced in Mughal-era texts, emphasized strategy and chance in racing pieces to a central home area.^[11] In the 19th century, British colonial influences led to an adaptation known as Ludo, patented by Alfred Collier in England on October 31, 1891, under the name "Royal Ludo," which simplified Pachisi's rules for Western players by incorporating a cubic die and a printed board.^[14] Ludo retained the core race mechanic but standardized the equipment, making it more accessible and contributing to its global spread through the British Empire. Tock emerged as a distinct variant among early French-Canadian settlers in Quebec, Canada, where communities adapted Ludo by substituting a standard deck of cards for dice to determine movement, creating a game emphasizing hand management and partnership play.^[15] Imported to Canada in the 17th century by French settlers and developed through informal family and community play between the 17th and 19th centuries as part of the region's gaming heritage, Tock—also known locally as "Jeu du Toc"—gained traction in French-speaking areas.^[16] By the mid-20th century, Tock had spread across Acadian, Maritime, and prairie Canadian populations, as well as border regions in the northeastern United States, becoming a beloved tradition in social gatherings tied to French-Canadian culture.^[17] Commercial versions featuring wooden boards and colored marbles appeared in the 1970s, enhancing its durability and appeal for home use. In the 2010s, digital adaptations emerged on online platforms, broadening access while preserving the game's partnership dynamics. No formal international tournaments exist, but local leagues persist in Canadian communities.

Components

Board and Tokens

The Tock board features a cross-shaped layout consisting of four colored arms—red, blue, green, and yellow—radiating outward from a central safe zone that serves as a neutral hub where tokens are protected from capture.^[15] Each arm contains approximately 15 to 20 spaces, incorporating a starting nest at the corner, a main path for general movement, a color-specific home stretch leading inward, and four sequential home slots for final positioning.^[18] Safe spaces are designated by colored triangles or circles along the paths, preventing token capture when occupied, while the central area provides additional protection as a shared neutral zone.^[19] Tokens in Tock consist of four per player, color-matched to the corresponding board arm (e.g., red tokens for the red arm), and are traditionally crafted as marbles or wooden pegs for durability and ease of movement.^[20] Before play begins, these tokens are stored in the player's colored nest at the board's corner.^[9] Boards are typically constructed from wood or cardboard, measuring 18 to 24 inches square to fit standard tabletops, with some editions offering reversible designs for switching between 4-player and 6-player configurations.^[20]^[9] The token movement path follows a clockwise circuit around the board: tokens originate in the nest, enter the main path through a designated start space, traverse the outer loop to complete one full circuit, then advance into the color-specific home stretch before settling into the four home slots in sequence.^[18]

Card Deck

The card deck in Tock consists of a standard 52-card playing deck plus 2 jokers, totaling 54 cards. Suits are generally irrelevant to gameplay, though some variants incorporate color matching for additional rules such as safe positioning. Cards have no inherent ranking beyond their face value, which determines movement distances or special effects during play.^[21]^[22] Preparation of the deck involves thorough shuffling by one player, typically designated as the initial dealer, with the dealer role rotating clockwise among participants after each full deal or round. The number of cards dealt varies by player count to balance hand sizes: for 2-4 players, each receives 5 cards initially; for 5 players, 4-5 cards; and for 6 players, 4 cards each. Subsequent deals adjust to 4 cards per player in larger groups to prevent overly large hands.^[21]^[19] The card draw mechanic ensures continuous play by requiring players to draw one card from the draw pile after playing or discarding a card on their turn, maintaining a hand size of 4-5 cards. Once the draw pile is depleted, the discard pile—comprising played cards—is shuffled to form a new draw pile. The dealing process, handled by the rotating dealer, briefly references the initial distribution before ongoing draws take over.^[21]^[9] Jokers serve as wildcards, allowing flexible use such as substituting for any movement value or providing capture immunity, often equivalent to a high-value card like 11 or 15 in standard play. In some implementations, playing a joker also permits an immediate additional draw and play.^[21]^[9] If the draw pile empties mid-turn without a discard pile to reshuffle, players may pass their turn or apply house rules, such as allowing a draw from an opponent's discards, though standard protocol prioritizes reshuffling the discards promptly.^[21]

Core Rules

Setup and Dealing

Tock supports 2 to 6 players, though 4 is the standard configuration, often played in partnerships where teammates sit diagonally opposite each other around the board, with turns proceeding clockwise.^[9]^[23] The game board features four colored corners, each assigned to a player or team based on matching colors, such as red for the red corner. Players place their four tokens in the starting nest corresponding to their color at the outset.^[24] To select the dealer, players typically draw cards face up from a shuffled deck, with the player receiving the highest card (or the first Jack in some variants) becoming the dealer; alternatively, the role rotates from the previous game's dealer. The dealer then shuffles the standard 52-card deck (excluding jokers unless specified in the variant) and prepares to distribute the cards.^[22] In most variants, players receive 5 cards in the first deal for 2-4 players (4 cards for 6 players), with subsequent deals of 4 cards each until the deck is exhausted and reshuffled, adjusted as needed for group size to fit the 52-card deck. Cards are dealt face down, one at a time in clockwise order starting with the player to the dealer's left.^[18]^[8] Once dealing is complete, the player to the dealer's left leads by playing any card from their hand, which determines token movement according to its value (detailed in card functions); subsequent players follow in clockwise order, each playing one card per turn.^[22]

Gameplay Mechanics

Tock's gameplay follows a structured turn-based system where players alternate in clockwise order, beginning with the player to the dealer's left. On a player's turn, they must play one card from their hand to advance one or more of their tokens along the board path, depending on the card's value or special effect—for instance, a 7 allows splitting the movement among multiple tokens if applicable. If a legal play is available, such as moving an existing token or entering the board with a starter card, the player is required to execute it, preventing strategic withholding of cards for future turns.^[22]^[19] Hand management is central to the game's flow, with players initially dealt 5 cards at the start of a round for most configurations, adjusted for player count, then 4 cards in subsequent deals. Players play exactly one card per turn, gradually depleting their hand without intermediate draws, which encourages efficient use of cards to avoid being caught with unplayable ones. Hoarding is inherently limited by the fixed hand size from the deal, and exceeding it is impossible under standard rules, promoting tactical decisions on when to apply cards to tokens or partners' pieces. If no legal move exists for any card in hand—such as when no token can advance without overshooting or violating placement rules—the player discards one card face down, maintaining the obligation to act but without board impact. Players may play on their partner's tokens if no own moves are available.^[22]^[9] Passing a turn is permitted only when no legal plays on own or partner's tokens are possible, in which case the player discards the selected card and the turn ends without movement; some rule sets require discarding the entire hand in such cases, followed by drawing a new hand on the next turn, though this varies by edition. This mechanic ensures steady progression while punishing poor positioning. Rounds advance through continuous turns until a player achieves victory by returning all tokens home or the deck is depleted, at which point a new deal occurs to refresh hands, preventing stalemates and sustaining play until resolution.^[22]^[19]

Movement and Capture

In Tock, tokens advance clockwise along the shared central path of the board, with the distance determined by the value of the card played from the player's hand. Numbered cards from 2 to 10 move a token forward by their face value, while an Ace permits movement of 1 space, and face cards have specific effects varying by variant; for example, in many rules, Jacks move 11 spaces, Queens 12, and Kings 13, while some assign special actions like switching to Jacks. Tokens may jump over other tokens during movement, but the path must be followed precisely without deviation.^[9] To bring a token into play from its starting nest, a player must play a designated starter card, varying by variant such as Ace or King in Super Tock, or Ace, King, or Joker in others, which places the token on the entry space adjacent to the nest. No other tokens can be moved until at least one has entered the board, ensuring players focus on initial deployment before advancing multiple pieces. The entry space itself serves as a safe zone, protecting the token from immediate threats.^[21] After completing a full circuit around the board—typically 52 spaces— a token qualifies to enter its color-specific home stretch, a linear path leading to the final home slots. Entry into this stretch and progression along it require exact card values to land on each successive slot, as overshooting is not permitted and tokens cannot leap over one another within the home area. This mechanic demands precise card management to safely navigate the final phase without stalling.^[19] Capture is a core interactive element, occurring when a moving token lands precisely on an opponent's token, immediately sending the captured token back to its nest for re-entry. This rule promotes aggressive positioning but is restricted: captures cannot occur on designated safe spaces, such as starred or colored neutral zones, nor on the paths of the player's own color, including the home stretch. A captured token restarts from the nest, requiring another starter card to re-emerge, which can significantly delay opponents.^[9] Some cards enable advanced movement options, such as splitting a single card's value across multiple tokens (e.g., a 7 divided into seven 1-space moves) or selecting which of several active tokens to advance, allowing strategic choices in evasion or pursuit. Standard rules prohibit backward movement entirely, preserving the forward momentum of play, though certain variants introduce reversal with specific cards like the 4 for tactical retreats.^[19]

Card Functions

Basic Card Effects

In Tock, number cards from 2 to 10 enable a player to advance one of their tokens forward by exactly the number of spaces corresponding to the card's rank.^[18]^[19] The Ace functions as a basic movement card worth 1 space forward or as an entry card, permitting a token to exit the nest and begin its journey on the board.^[18]^[19] Face cards provide larger standard movements: the Jack advances a token 11 spaces, the Queen 12 spaces, and the King 13 spaces, with the King also capable of serving as an entry card like the Ace.^[18]^[19] Some editions simplify face card values to 10 or 11 spaces uniformly, though the differentiated progression of 11, 12, and 13 is common in manufacturer rules.^[8] Card suits play no role in standard basic effects, rendering all suits equivalent regardless of color or symbol.^[18]^[19] Tock features no trump suits, ensuring all cards hold equal basic power aside from rank-specific movements and any special abilities.^[18]^[19] If a player draws a card that cannot be legally played to move a token—such as when no suitable token position exists—the card must be discarded face up to a central discard pile.^[19]^[25] When the draw deck is depleted, the discard pile is shuffled to reform the draw deck, allowing play to continue without interruption.^[26]^[19]

Special Card Abilities

In Tock, several cards possess special abilities that provide strategic advantages beyond their standard numerical movement values, allowing players to manipulate positions, enter tokens, or evade captures in unique ways. These abilities are typically restricted to legal targets and cannot be used if no valid move is available, with hand size limits (usually 4-5 cards) preventing overuse by forcing discards or draws each turn. Abilities may vary by edition or regional rules.^[8] The 4 card moves a token backward 4 spaces (cannot enter Home directly), which can be used strategically to reposition or avoid obstacles.^[19]^[22] The 7 card supports split movement, such as allocating 5 spaces to one token and 2 to another (or other combinations totaling 7), offering flexibility across multiple tokens; passing over opponents' tokens sends them back to start.^[19] Face cards introduce further tactical depth. The Jack moves a token 11 spaces or allows swapping the position of any two tokens (own or opponent's, excluding start/Home in some variants).^[22] The Joker moves a token 15 spaces or starts a token, and allows the player to draw and play an additional card (move distance may vary 15-25 in editions).^[22] Kings serve as starters or enable a 13-space move (in some rules, 13 only after all tokens are deployed).^[19]

Winning Conditions

Victory and Endgame

The primary win condition in Tock is for the first player or team to maneuver all of their tokens into their designated home slots, at which point the round concludes immediately and that player or team is declared the winner. In individual play (2 players), this involves all four tokens; in team play (4 or more players, typically 2 vs. 2), it requires all eight tokens (four each for partners) to reach home, with the first teammate to finish using remaining cards to assist their partner.^[19]^[9] To enter the home slots, tokens must land precisely on the required spaces without overshooting, necessitating exact card values for movement; players can achieve this by selecting appropriate cards or, in the case of a 7, splitting the move across multiple steps to fine-tune positioning.^[19] Home slots are filled sequentially from the first position downward, and tokens within them cannot be captured or displaced by opponents, providing safe haven once entered.^[9]^[19] As tokens approach completion, a player or team with all but one token in home can direct remaining cards toward advancing the last one, streamlining the final push without risk of interference in the home area.^[9] A typical round of Tock lasts 20 to 40 minutes, though multiple rounds are often played to form a full match.^[27]

Optional Scoring Systems

Optional scoring systems in Tock allow players to extend gameplay beyond a single round, particularly in house games or informal tournaments, by tracking points across multiple rounds to determine an overall match winner. Various house rules exist for awarding points, such as for tokens returned home or other achievements, with no official standards; these are common in Canadian play where Tock originated as a family game.^[9] In tournament settings, scoring is often cumulative over multiple rounds and tracked manually, suited for longer sessions or competitive environments emphasizing skill.^[28]

Variants

Regional Variants

A Cape Breton variant, documented in some sources, restricts the 4 card to moving four spaces backward only and allows the 7 card to make seven individual moves of one space each. Aces can be used as 1 or as a starter. Tock originated in Korea and has been adapted in various regions, particularly gaining popularity in Canada and the Maritimes during the 20th century through family and community play.

Team and Partnership Variants

Team and partnership variants of Tock adapt the game for cooperative play among 2 to 6 players, typically dividing participants into pairs or larger groups that share objectives and tokens while competing against opponents. In these modes, players seated opposite each other form teams, sharing a single color for their tokens to emphasize collaboration over individual achievement.^[9]^[29] The most common setup is for four players, forming two teams of two, where partners sit across from each other and alternate turns clockwise around the table. Each team controls eight tokens total—four for each partner—and players may move any of their team's tokens on their turn, provided a valid card is played, similar to standard movement rules. A team cannot capture or send home its own partner's tokens, preventing internal conflict and reinforcing cooperative strategy.^[9]^[26] Victory in partnership play requires the entire team to complete the circuit: both partners must bring all eight tokens safely into the home area before the opposing team does, with shared scoring based on this collective success. Some variants allow players who have finished their own tokens to assist their partner more directly by prioritizing moves on the teammate's pieces.^[9]^[26]^[25] For six players, variants typically organize into three pairs or two teams of three, using an expanded board to accommodate the groups. In three-pair setups, turns proceed clockwise with each pair alternating internally if needed, and captures are restricted to opposing teams only, maintaining the no-friendly-fire rule. Relay-style turns within larger teams of three allow consecutive plays among teammates to build momentum, though standard clockwise rotation applies across teams. Winning follows the same combined-token principle, with the first team to home all its tokens (twelve in a 3-vs-3) claiming victory.^[9]^[8] These team adaptations have gained popularity in social and family settings, particularly in Quebec and surrounding New England communities since the mid-20th century, where they foster collaboration during tournaments and gatherings. Originating from modifications to traditional Parcheesi by early French Canadian settlers, partnership play enhances the game's appeal for group dynamics in these regions.^[30]^[8]

Other Modifications

Super Tock 6 is a commercial edition for up to six players.^[31] Digital adaptations of Tock have emerged on platforms like Board Game Arena, enabling online play for 2 to 6 players with support for team formats. These versions incorporate optional rules, such as the 5 card's effect limited to moving one's own pawns five spaces forward in some configurations.^[26] Player-created and commercial modifications often focus on thematic customizations, including holiday-themed boards produced by artisan makers. For instance, shops like those on Etsy offer handmade Tock boards with personalized engravings or seasonal designs, while companies such as Zepherin Games provide bespoke editions with custom names overlaid on the board or cards. These adaptations enhance replayability without altering core mechanics, appealing to families seeking unique aesthetics.^[32]^[33] Commercial productions of Tock, including editions from Zepherin Games, frequently include proprietary house rules to streamline play or accommodate specific group preferences, such as team configurations in multi-player setups. The absence of an official governing body for the game has fostered a wide array of such adaptations, allowing manufacturers and communities to innovate freely on components and rules.^[9]^[34]

References

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Tock Embedded Operating System
An embedded operating system designed for running multiple concurrent, mutually distrustful applications on low-memory and low-power microcontrollers.Getting Started · Hardware · Papers · Documentation
[2]
tock/tock: A secure embedded operating system for microcontrollers
Tock is an embedded operating system designed for running multiple concurrent, mutually distrustful applications on Cortex-M and RISC-V based embedded ...Tock Embedded OS · Issues 125 · Pull requests 27 · Discussions
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The Tock Embedded Operating System - ACM Digital Library
Tock, a new operating system for low-power platforms, takes advantage of the limited hardware-protection mechanisms available on recent microcontrollers.
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Features
### Summary of Tock Features
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[PDF] Tock: From Research to Securing 10 Million Computers - amit levy
Abstract. Tock began 10 years ago as a research operating system developed by academics to help other academics build urban sensing applications.Missing: Michigan | Show results with:Michigan
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[PDF] Multiprogramming a 64 kB Computer Safely and Efficiently
This paper presents Tock, a new operating system for low- power embedded platforms that addresses these shortcomings in existing systems to provide a rich ...
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Tock on Steam
14-day returnsJul 6, 2018 · Tock (also known as Tuck in some English parts of Quebec) is a board game (jeu de tock), similar to Ludo, Aggravation or Sorry!, in which ...
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Tock Rules | Rettna
The game of Tock has it's origins from the India game Parchisi. When settlers arrived in Quebec they altered Parchisi in a few ways which became known as Ludo ...
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Object of the game: Get your four marbles and your partner's four marbles into their homes before your opponents do.Missing: origin | Show results with:origin
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doberman pizza. misc. tock.
### Overview of Tock Game
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Apr 21, 2022 · An ancient Indian board game played by two to four people. Its oldest evidence dates to 16th century Mughal India with origins tracing back ...
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Sep 11, 2018 · Pachisi AKA Ludo, an ancient Indian game which Akbar was addicted to, is now a strategy game taught at business schools. On August 29, 1891 ...<|control11|><|separator|>
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The Indian Games of Pachisi, Chaupar, and Chausar - Penn Museum
The Hindi word for “twenty-five” is pachis (pacis), from which is derived the noun pachisi (pacisi) meaning “collection of twenty-five objects” or “that which ...
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14636" inscribed on it and also on the Rules Leaflet. Patent No. 14636 was applied for by Alfred Collier for Royal Ludo on 29th August 1891 and accepted on 31 ...Missing: 1896 | Show results with:1896
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Super Tock 4 | Board Game - BoardGameGeek
Rating 5.8/10 (224) Super Tock 4 is a 2-4 player game where players race tokens using cards for movement, similar to Pachisi, with the goal of getting all tokens home.
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None
### Summary of Super Tock Board Design and Components (Source: https://fgbradleys.com/wp-content/uploads/rules/SuperTock.pdf)
[19]
[PDF] Tock Manual
Tokens are not allowed to jump over other tokens within the house. Teams. Two versus two players standard - Players on opposite sides of the board team up.
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Tock Board Game - Lee Valley Tools
### Summary of Tock Board Game Physical Aspects
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[PDF] RÈGLES DU JEU DE TOCK - Denis Guertin Ébéniste
Whether they know it as Tock or by another name, the basis of the game is pretty much the same; be the first player to enter all 4 marbles into your Home to win ...
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None
### Summary of Card Deck Rules in Tock
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Tock Tock Game game instructions for 4 player G-008-S
Mar 26, 2018 · Tock Tock game is played by 2 to 6 persons, who play in teams against each other. Always 2 players form a team, sit diagonally opposite and play together.
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### Setup and Dealing for Tock 4 Game
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Tock Rules | PDF | Leisure Activities | Consumer Goods - Scribd
Tock is a four-player board game played with cards and marbles. Players take turns playing cards from their hand to move their marbles around the board.
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Tock is a card-and-board game for 2 to 6 players. With 4 or 6 players, it is possible to create two or three teams of 2 players, sitting opposite of each other.Missing: origin Quebec
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Gamehelptock - Board Game Arena
At the beginning of each round players are dealt 5 cards which they play in turns to move their tokens (or marbles) around the board. If at any time a token ...Missing: rules deck joker draw
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TOCK 4 - Logica Puzzles
In stock 25-day deliveryThe famous TOCK GAME (or Tock), the Canadian Parcheesi up to 4 players! An exciting game that will bring out all your competition!Missing: origin Quebec
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Tock • Championnat de Toc Toc competition - Board Game Arena
Each participant plays the same number of games, and is paired with players close to their level. Number of matches. 4. Number of players in a match.Missing: rules | Show results with:rules
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Tock Tock Game game instructions for 4 player G-008-S
Mar 26, 2018 · The Tock Tock Game is played with cards, the card set "Romme, Canasta, Bridge", consisting of 2 sets of 55 cards including 3 Joker cards. These ...Missing: mechanic | Show results with:mechanic
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Tock Game 4-6 Players - Au Jeu Game On
The game was imported to Canada in the 17th century by French settlers . The ... The jack can exchange with any ball in play on the board, except the ...
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Super Tock 6 | Board Game - BoardGameGeek
Rating 5.3/10 (63) Super Tock 6 is a 2-6 player card game using hand management and open drafting. Players move pawns using cards, with special card and board properties. It is a ...
[33]
Vtg Super Six Tock Wooden Game Board By Jouets Toys of Canada ...
In stock Free deliveryVintage Super Six Tock Wooden Game Board By Jouets Toys of Canada 22" × 22". Includes Instruction Sheet. Very Good Overall Condition For Its Age.
[34]
Play Tock online from your browser - Board Game Arena
Number of players, 2, 4 ; Game type, Free-for-all, 2 vs 2 (if possible) ; [VARIANT] Effect of the 5, 5 forward, own pawns only, [*] 5 forward, any player pawn ...
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https://www.etsy.com/market/custom_tock_game
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Zepherin Games – Custom 4 Player Tock
In stockZepherin Games Custom 4 Person Tock Design includes Customized Name over Tock Cards. Made with 1/2′′ premium birch plywood and a solid walnut frame.Missing: regional Cape Breton Vermont
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Zepherin Games – Online Shop
### Summary of Tock Editions, House Rules, and Customizations by Zepherin Games