Dominoes
Tile & Domino Games · 9 specs
Direct Answer
Dominoes is a family of tile-matching games played with standardized rectangular tiles divided into two square ends marked with pips (0 to 6 in Double-Six sets). Primary variants include the Draw game, Block game, and Mexican Train, with official tournament standards governing Double satisfaction, train opening markers, and pip-count scoring.
Source: World Domino Federation / International Domino Standards · Last reviewed Aug 28, 2026
Specs
| Double-6 Set Size | 28 tiles (up to 6-6) |
| Double-9 Set Size | 55 tiles (up to 9-9) |
| Double-12 Set Size | 91 tiles (standard for Mexican Train) |
| Double-15 Set Size | 136 tiles (large group sets) |
| Standard Tile Dimensions | 1.875 × 0.9375 × 0.25 inches (48 × 24 × 6.5 mm) |
| Professional Tile Size | 2.0 × 1.0 × 0.375 inches (51 × 25 × 9.5 mm) |
| Jumbo Tile Size | 2.0 × 1.0 × 0.50 inches (51 × 25 × 12.7 mm) |
| Tournament Tile Size | 2.125 × 1.0625 × 0.50 inches (54 × 27 × 12.7 mm) |
| Formula for Tiles in Set | (n + 1)(n + 2) ÷ 2 where n = highest pip count |
Standard Domino Set Types
Domino sets are classified by the highest double in the set:
- Double-Six (28 Tiles): Standard 2–4 player games (Draw, Block, All Fives).
- Double-Nine (55 Tiles): Suitable for 4–6 players.
- Double-Twelve (91 Tiles): Standard format for Mexican Train and Chickenfoot (up to 8 players).
Mexican Train Official Rules
Mexican Train uses a Double-12 set with a central hub station:
- Engine: The highest double (12-12 in round 1) is placed in the center hub.
- Personal Trains: Each player builds an outward line matching the center engine pip.
- The Mexican Train: A public line that any player may play on, started with an open hub slot.
- Marking a Train: If a player cannot play on their turn, they draw from the boneyard. If still unable to play, they must place a marker (train token) on their personal train, making it open to all opponents until they play on it.
Double Satisfaction Rule
When a player plays a Double tile, it must be placed crosswise and 'satisfied' (covered) immediately by playing a second tile matching that number. If the player cannot satisfy it, play passes to subsequent players who MUST attempt to satisfy the double before any other play can be made on the table.