How to play
- Goal
- Place exactly one circle, one square and one triangle in each room, without matching symbols touching, and connect all symbols through edges.
- How it ends
- The chart is won when every cell is decided, each room contains its three symbols, equal symbols share neither edges nor corners, and all symbols are connected; Undo repairs marks.
- Record
- Your first unassisted solve of each chart is kept in this browser; verified solves under twenty-four hours compete for fastest-time records. Replays are practice.
- Put exactly one circle, one square and one triangle in every outlined room. Leave all remaining cells empty.
- Identical symbols cannot touch horizontally, vertically or diagonally, even across room borders.
- All symbols must form one group connected through cell edges. Empty cells do not need to connect.
- Select a cell, then choose a shape or Empty. Empty is a final decision; Erase makes a cell undecided again. Notes are optional reminders.
- Fixed shapes stay fixed. Undo repairs entries; Restart clears your entries after confirmation and keeps the original first clock running.
Controls
| Tap a cell; shape rail | Select a cell, then choose a shape or Empty |
|---|---|
| Arrows; 1–4 | Move; circle, square, triangle or Empty |
| Notes / N; Shift + 1–3 | Toggle pencil mode; add or remove a shape note |
| Delete / Backspace | Erase the selected editable cell |
| Z / Y; Undo / Redo | Withdraw or restore entries and notes |
| Enter / Space | Open the shape rail |
| Escape | Cancel a held tap, close a dialog or return to the atlas |
| Controller | D-pad moves; A opens the rail or confirms; B returns; X Empty; Y Erase; shoulders Undo/Redo; Start tools; Back rules; Notes is on the rail |
Tips for Hakoiri
- Count each room Every room needs all three shapes exactly once.
- Check corners Matching shapes cannot meet at a corner, including across gold room borders.
- Keep a route open The symbols must connect through edges; diagonal contact cannot join the collection.
Questions about this game
Must empty cells connect?
No. Only the symbols must form one edge-connected group.
Can different shapes touch?
Yes. Different shapes can touch; identical shapes cannot, even diagonally.
How do I finish a spare cell?
Choose Empty, or press 4. Erase leaves a cell undecided.
Can replay improve my first time?
No. Your first completed time is retained; replay is untimed practice.
All charts are open. Progress saves in this browser; a reloaded attempt finishes locally on its original clock.
Watch how to play
About Hakoiri
Restore geometric seals in a lamplit library. Each room needs its own circle, square and triangle, but the entire collection must connect across room borders.
All 160 original charts are open, from four by four to six by six. Each chart has one independently verified solution and a deduction proof from its fixed symbols.
Your first completed time stays with each chart. An uninterrupted verified first solve under twenty-four hours on the game page can claim the named best; replay is untimed practice.
