How to play
- Goal
- Tile every open cell into straight or bent three-cell pieces.
- How it ends
- A chart ends when every open cell belongs to a piece and no two edge-neighbouring pieces have the same shape and orientation; there is no loss.
- Record
- Your first completed time on each chart is kept and may enter the records.
- Tap three open cells that connect along edges to lay a piece. Tap a laid piece to lift it. Dark voids are never filled.
- Fill every pale cell with straight strips and bent corners. Two pieces with the same shape and orientation may touch at corners, but never along an edge. Red pieces are touching twins. The worked example turns two lower strips into differently oriented corners.
- Undo lifts the last change. Restart clears the chart while its first-opening clock keeps running. A chart finishes automatically when all pale cells are tiled and no twins touch. Replays are practice.
Controls
| Tap / click three cells | Lay one straight or bent piece |
|---|---|
| Tap / click a piece | Lift it to try another placement |
| Arrow keys | Move the visible cell focus |
| Enter / Space | Select the focused cell |
| Z / Undo | Restore the previous piece state |
| R / Restart | Clear this chart while keeping the first clock |
| Escape | Cancel selection, close a panel, or return to atlas |
| Gamepad | Choose cells, undo, restart and reach every panel |
All four shelves are open. An unfinished chart saves locally; after a reload its first finish remains local. Only an uninterrupted first solve can rank. The answer and verifier stay out of the browser build. Every chart is uniquely solved by local deductions; the same-orientation neighbour rule matters.
Watch how to play
About Heteromino
Restore a moonlit Orenvalt mosaic with three-cell stones. A straight strip or bent corner occupies every pale cell; dark voids remain open.
Explore 160 original charts across four open shelves. Each has one independently proven answer and a local deduction path without guessing.
Your first solve time stays in this browser. An uninterrupted first solve can claim the named best shown beside the clock and on each chart card.
