How to play
- Goal
- Join adjacent numbered stones into dominoes so every unordered pair, including doubles, appears exactly once.
- How it ends
- A chart completes when every stone belongs to one domino and the full set is present; there is no loss.
- Record
- Your first solve time is kept per chart, and the fastest verified first solve appears with its holder.
- Tap one numbered stone and then a neighboring stone to join them. Reversed numbers count as the same pair. The Domino Set tray shows which pairs are present; a red pair means it appears twice.
- Scan for a pair with only one possible home, or a stone with only one remaining partner. The worked example shows how a joined zero-zero leaves the rightmost zero-one as the only home for that pair.
- Tap the same two stones again to separate them. Undo restores one gesture; Restart clears joins while the original clock continues. A chart finishes when every stone belongs to one domino and each pair appears once. There is no loss. Only the first solve is ranked.
Controls
| Tap / click a stone | Select the first stone; tap a neighbor to join or separate |
|---|---|
| Arrow keys | Move focus between adjacent stones |
| Space / Enter | Select or join the focused stone |
| Backspace / Delete | Separate the focused domino |
| Z / R | Undo a join / restart the chart without resetting the clock |
| Escape | Clear a selection or close the rules and settings |
Every chart has one exact-cover answer, an independently checked direct deduction trace, a stable content identity and a private witness. Saves use morass.dominosa.v1; sound follows the shared arcade setting. No ads or analytics run inside the game.
Watch how to play
About Dominosa
Beneath an ivy-covered garden, a numbered mosaic hides a complete set of dominoes. Join adjacent stones until every unordered pair, including doubles, appears exactly once.
The atlas holds 160 original charts in four set sizes. Every chart has one independently verified answer and a direct deduction path without a blind guess.
Your first solve time is kept for each chart. An uninterrupted first finish can claim the named public best.
