Choose the domino range required by the rules you intend to play. Double-six, double-nine, and double-twelve describe the highest value on a tile, not the physical tile size or an automatic maximum number of players.
| Complete conventional set | Values included | Number of unique tiles |
|---|---|---|
| Double-six | Blank through six | 28 |
| Double-nine | Blank through nine | 55 |
| Double-twelve | Blank through twelve | 91 |
Where those counts come from
A complete double-n set contains one tile for each unordered pair of values from zero through n, including matching pairs. The count is (n + 1) × (n + 2) ÷ 2. The figures above are arithmetic results from that inventory rule; the linked Yellow Mountain Imports guide also specifies ninety-one tiles for double-twelve. Promotional extras should be counted separately.
Start with a named game and version
The linked Mexican Train rules use a double-twelve set and give hand sizes for two through eight players. That does not mean every domino game uses the same range or that the number twelve refers to twelve participants. Read the chosen rules before buying a larger set merely for a larger gathering.
A larger inventory can contain a smaller one
If a complete double-twelve set has all the conventional pairs, removing every tile with a value above six leaves the double-six subset. This is a consequence of the inventory, not a new rules variant. Keep the unused tiles separate so they do not enter the draw pile accidentally. The extra sorting and storage may be inconvenient if you only play one small-set game.
Separate markings from rules
Colored pips and printed numbers are alternative ways to communicate values. Inspect legibility, contrast, and how easily players distinguish neighboring values. Do not assume color alone is sufficient for every player, or that numbered tiles change the permitted plays. Match the marking style to the people using the set.
Physical size needs its own check
A double-twelve tile can be small or large. Verify length, width, thickness, and whether the tile will stand or fit a chosen rack or hub. The number of tiles also affects the space needed for hidden hands and the draw pile. We have not measured the playing footprint of every domino layout.
Buy the range you will use
Choose double-six for a ruleset that calls for it and a compact inventory you prefer to handle. Choose double-nine or double-twelve when a named game, supported group size, or desired flexibility requires the extra values. Accessories should follow that decision rather than substitute for it.
Sources and method
This is a researched decision guide. Product facts were checked against the primary sources below on November 2, 2026. Selection advice and worked examples are editorial reasoning. This guide does not include hands-on testing.
