Domino Shade Solver

Domino Shade Solver — Step by Step

Drag across squares to join them into regions, then press Solve. Or play a generated puzzle and send it here with one click.

Domino Shade Solver: rules, how to use it, tips

Shade exactly two squares in every region so the shaded squares form dominoes that never touch side to side.

The grid is divided into regions.
Shade exactly two squares in every region.
Every shaded square shares a side with exactly one other shaded square — together they form a domino.
A domino may lie inside one region or cross from one region into the next. Dominoes may touch at corners, but never along a side.

Choose the size and draw the regions (or press Sample).
Press Solve and step through: regions with few ways, dominoes that would touch, and pairs of regions together.

Tiny regions. A two-square region is a domino. A straight three-square region has its middle square shaded.
Around a domino. Once a domino is finished, every square touching it along a side is white.
Lonely squares. A shaded square with only one possible partner must pair with it.
Two regions together. When two small regions sit side by side, try the few ways each can be shaded — often only some combinations keep the dominoes apart.

The full guide, with a worked example and common mistakes: How to play Domino Shade.

Can a domino cross from one region to another?

Yes — each square still counts for its own region.

Can dominoes touch diagonally?

Yes, at corners only.

Is there always one answer?

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

How do I solve one from a book?

Open the Domino Shade Solver, draw the regions and press Solve.