How to play Domino Hunt

Split the grid into dominoes so that every domino of the set appears exactly once. Also known as Find the dominoes, Domino placement.

▶ Play Domino Hunt ⊞ Open the solver

The rules

The grid holds a full set of dominoes (for example 0|0 to 6|6).
Every square belongs to exactly one domino, made of two neighbouring squares (across or down).
Each domino of the set appears exactly once — 2|5 and 5|2 are the same domino.

Playing Domino Hunt on Puzzle Solvers

Choose a domino set (0–3 up to 0–9) and a difficulty, then press New Puzzle.
Drag from one number to its neighbour to place a domino, or tap near the line between them. Tap again to remove it.
Use Rule out (or right-click) to cross off joins that can’t be dominoes. The checklist under the grid shows which dominoes you’ve placed — repeats turn red.
Hint explains the next domino: one that fits in only one place, or a number with only one partner left.

Open the Domino Hunt game →

Using the Domino Hunt solver

Choose the domino set and type the grid (or press Sample).
Press Solve and step through: dominoes with only one place, numbers with only one partner, and what-ifs.

Open the solver →

A worked example

In a 0–3 set, the pair 0|3 appears next to each other only once in the grid — place it.

That leaves the square above it with only one free neighbour, so it pairs with that one, making 1|2. Cross off every other 1|2.

Strategies

Unique pairs. Look for a pair of numbers that sit next to each other in only one place — that domino must be there.
Lonely squares. A square whose other neighbours are all used must pair with the one neighbour left.
No repeats. Once 4|4 is placed, cross off every other place where two 4s sit side by side.
Corners and edges. Corner squares have only two neighbours, so they’re often forced early.
Doubles. Doubles (like 6|6) usually appear only once or twice side by side — find them first.

Common mistakes

Using a domino twice (2|5 and 5|2 count as the same).
Leaving a single square that can’t pair with anything.
Forgetting doubles count as dominoes too.

Where it comes from

Domino-placement puzzles appeared in puzzle magazines in the early 20th century and remain a favourite because they need no knowledge beyond a set of dominoes.

Frequently asked questions

How many dominoes are in each set?

0–3 has 10, 0–4 has 15, 0–5 has 21, 0–6 has 28, 0–7 has 36 and 0–9 has 55.

Is there always one answer?

Yes — every puzzle here is checked to have exactly one solution.

Can I show real domino dots?

Yes — turn on ‘Show dots instead of digits’.

How do I solve one from a book?

Open the Domino Hunt Solver, type the grid and press Solve.

Keep going

All guides: How to play every puzzle and game.