Double-6 vs Double-9 vs Double-12
Not all domino sets are the same — and choosing the wrong one is one of the most common mistakes new players make.
Different domino games require different set sizes, and using the wrong set can shorten the game, limit the number of players, or make certain variants impossible to play.
This guide explains the differences between Double-6, Double-9, and Double-12 domino sets, and helps you choose the right one for the game you want to play.
What Does “Double” Mean in Dominoes?
In dominoes, the word “double” refers to the highest numbered tile in the set.
For example:
- A Double-6 set goes from 0-0 up to 6-6
- A Double-9 set goes from 0-0 up to 9-9
- A Double-12 set goes from 0-0 up to 12-12
The higher the double, the more tiles in the set.
Double-6 Domino Set
Total tiles: 28
Best for: Classic dominoes, small groups
A Double-6 set is the traditional domino set many people grew up with.
Common games played with Double-6:
- Classic Dominoes
- Block Dominoes
- Draw Dominoes
Pros:
- Simple and familiar
- Faster rounds
- Easy to store
Cons:
- Limited number of players
- Not suitable for modern group games
If you’re playing basic dominoes with 2–4 players, a Double-6 set is usually enough.
👉 See Dominoes Rules (General) for games that use Double-6 sets.
Double-9 Domino Set
Total tiles: 55
Best for: Medium groups, longer games
Double-9 sets add more tiles, making games last longer and allowing more flexibility.
Common uses:
- Larger Block or Draw games
- Casual house rules
- Some regional variants
Pros:
- Supports more players
- Longer gameplay
- More strategic depth
Cons:
- Still not enough for Mexican Train
- Less commonly sold
Double-9 sets sit in the middle — useful, but not essential for most players.
Double-12 Domino Set (Most Important)
Total tiles: 91
Best for: Mexican Train, large groups, modern play
A Double-12 set is required for Mexican Train Dominoes and is the most popular choice in the United States today.
Games that require Double-12:
- Mexican Train Dominoes
- Many modern multiplayer variants
Pros:
- Supports up to 8 players comfortably
- Longer, smoother gameplay
- Most versatile set
Cons:
- Larger storage case
- Slightly higher cost
If you plan to play Mexican Train, this is non-negotiable.
👉 Learn why in the full Mexican Train Dominoes Rules guide.
👉 Ready to buy? See the best Mexican Train domino sets.
Quick Comparison Table
| Set Type | Tiles | Best For | Mexican Train |
|---|---|---|---|
| Double-6 | 28 | Classic games | ❌ No |
| Double-9 | 55 | Medium groups | ❌ No |
| Double-12 | 91 | Group play | ✅ Yes |
Which Domino Set Should You Buy?
If you only buy one domino set:
- Choose a Double-12
- It covers the widest range of games
- It’s required for Mexican Train
- It future-proofs your purchase
This is why most players eventually upgrade from Double-6 to Double-12.
Common Buying Mistakes
- Buying a Double-6 set for Mexican Train
- Choosing novelty or undersized tiles
- Ignoring readability and weight
These issues are covered in more detail on the Best Mexican Train Domino Sets page.
Final Thoughts
Understanding domino set sizes makes everything else easier — from learning new games to buying the right equipment.
Once you know which set you’re using, the rules fall into place naturally.
If you’re ready to play:
Or explore Dominoes Rules for other variants
Start with Mexican Train Dominoes Rules