How to play
- Goal
- Fill every tile with 1, 2 or 3 to form connected regions containing exactly that many tiles.
- How it ends
- A chart is complete when all tiles and printed clues obey the region rules; there is no loss.
- Record
- Your first unassisted solve of each chart earns one fastest-time record; replays are practice.
- Choose ink 1, 2 or 3, then tap or drag across tiles. Erase removes your ink; printed clues cannot change.
- The worked picture shows one stone beside a bent region of three. Two neighbouring ones would make a region of two tiles and are invalid. A region may contain several matching clues or none.
- Undo and Redo reverse a tap or complete stroke. Restart clears your ink after confirmation without resetting the first-opening clock. All charts are open from the atlas.
Controls
| Choose ink; tap / click | Write 1, 2 or 3; Erase removes your ink |
|---|---|
| Drag across tiles | Paint one stroke; cancellation withdraws it |
| Arrow keys; 1–3 | Move the cursor; write a number |
| Enter; Delete / Backspace | Use selected ink; erase |
| Z / Y; Undo / Redo | Reverse or restore a tap or full stroke |
| Restart | Clear ink after confirmation; keep the first clock |
| Escape | Close a dialog or return to the atlas |
| Gamepad | D-pad moves, A inks, X erases, shoulders choose ink, Y undoes, B returns and Start opens Settings |
Tips for Trinudo
- Start with ones A one stands alone; neighbouring tiles cannot be one.
- Complete the region A finished pair or triple prevents a separate region of the same size beside it.
- Follow the clues A printed two needs exactly one companion. A three may be straight or bent.
Questions about this game
Must every region contain a clue?
No. A region may contain several matching clues or no clue.
Can equal-size regions touch diagonally?
Yes. Only sharing an edge is forbidden.
Can replay improve my first time?
No. The first completed time stays saved; replay is untimed practice.
The 160 chart answers differ under rotation and reflection. Independent combination-enumerated exact covers include unclued regions and prove uniqueness; checked local region deductions finish every chart. Private generators and witnesses do not ship. Progress uses morass.trinudo.v1.
Watch how to play
About Trinudo
Restore a stone map in three mineral inks. Join numbered tiles into connected regions of exactly one, two or three stones.
Four open shelves hold 160 original charts. Printed clues stay fixed; separate regions of the same size cannot share an edge, though they may touch at a corner.
Each chart has one independently proved completion and a checked local deduction path. Your first time is kept; replays are untimed practice.
