How to play
- Goal
- Place separate dark dominoes to divide pale lands. Each land contains one letter kind, all copies of that letter, and at least one letter.
- How it ends
- The chart finishes when every cell is marked and all dominoes and lands agree; marks can be changed, so there is no loss state.
- Record
- The fastest uninterrupted first solve of each chart is kept with its holder's name; replay is practice.
- Dark cells form side-connected dominoes of exactly two cells. Different dominoes may meet at corners but cannot share an edge.
- Letters always stay pale. Every side-connected pale land must contain at least one letter, and all its letters must be the same kind.
- All copies of a letter must belong to the same pale land. Pale 2×2 patches are allowed; diagonal contact does not connect lands.
- Selection alone makes no mark. Choose Pale, Dark or Erase. Every blank cell needs a mark before the chart can finish.
Controls
| Mouse / touch | Select a cell, then Pale, Dark or Erase; Mark repeats the chosen tool |
|---|---|
| Arrows / Space or Enter | Move the cell cursor / repeat the chosen tool |
| 1 / 2 / 3 / Delete | Choose Pale / Dark / Erase / erase the selected cell |
| Z / Y / R | Undo / Redo / Restart confirmation |
| Controller | D-pad moves; A applies; X cycles tools; Y undoes; shoulders undo/redo; B returns through grid to atlas; Start opens settings. |
Tips for Letter Domains
- Separate unlike letters A blank cell directly between different letters must be dark.
- Find the partner Every dark cell needs exactly one dark side neighbour; fixed letters cannot be partners.
- Protect matching letters Keep a side-connected pale route between all copies of the same letter.
- Watch complete dominoes A third dark cell touching a completed domino makes the group too large.
Questions about this game
Can dominoes touch?
At corners, yes. Separate dominoes cannot share an edge.
Can a letter be dark?
No. Every fixed letter stays pale.
Can a pale land have no letter?
No. Every land needs at least one fixed letter.
Are pale 2×2 patches forbidden?
No. They are allowed.
Can matching letters occupy different lands?
No. All copies of each letter must connect through pale sides.
Can Replay replace my first time?
No. Practice preserves your first time and saves its own marks and Undo.
Fixed letters always stay pale. Mark every blank cell explicitly. Pale 2×2 patches are allowed. Practice marks and Undo survive reload; your first time stays unchanged.
Watch how to play
About Letter Domains
Separate a lettered map with dark two-cell dominoes. The pale lands must each contain exactly one letter kind, and all copies of a letter belong together.
All 96 original charts are open: twelve 4×4, twenty-four 5×5 and sixty 6×6. Every chart has one independently verified complete shading.
