A pure logic puzzle. Find the hidden domino boundaries in a grid of numbers. No guessing required.
Every puzzle is solvable through deduction alone. No guessing, no luck, no randomness in gameplay.
AI-rated puzzles from Easy (forced moves) to Hard (requires trial-and-error). Pick your challenge.
Same puzzle for everyone, every day. Compare your time with friends.
Dark, Ocean, Forest, Sunset, and Light. Play in the mood that suits you.
Tap-tap or swipe to pair. Works perfectly on any screen size, any device.
Seeded generator creates unlimited unique puzzles. Share a seed, challenge a friend.
The grid is filled with numbers. Hidden beneath are dominoes — each covering exactly two adjacent cells.
Tap a cell, then tap its neighbor to form a domino pair. Or swipe between them on mobile.
Each number combination (like 2•5) appears exactly once. Duplicates light up red. Fill the whole grid to win.
Every puzzle is rated by a logical solver that determines what techniques you'll need.
Each domino can only go in one place. Scan and place.
Requires elimination — some cells have only one valid partner.
Logic alone isn't enough. You'll need to test hypotheses.