How to play
- Goal
- Shade night stones so each numbered seal can reach exactly its stated number of blank floor tiles by walking orthogonally without crossing another seal.
- How it ends
- A chart clears when every seal's reachable count matches the shaded pattern; there is no loss, and pale marks are optional.
- Record
- The fastest first clear of each chart is kept with its holder's name; later clears are practice.
- Choose a chart. Each numbered seal counts distinct blank, unnumbered floor tiles it can reach by walking up, down, left or right. The walk may turn. Night stones and every other numbered seal block it; the seal never counts itself. The worked picture shows why a zero seal forces its four side exits dark, then how another seal's walk turns a corner.
- Tap a free tile to cycle undecided → night stone → pale → undecided. Tap a numbered seal to light confirmed pale floor and still-possible undecided floor. If a seal turns red, its target is impossible with the current marks. Pale X notes can help reasoning, but placing the correct stones alone clears the chart.
- Undo restores one edit and Restart clears marks while the first-open clock keeps running. A first clear can rank for time once; replays are untimed practice. There is no loss state, and all four shelves remain open.
Controls
| Tap / click a floor tile | Cycle undecided, night stone and pale |
|---|---|
| Tap / click a seal | Inspect its possible and confirmed reach |
| Right click | Cycle backward |
| Long press | Place or remove a pale mark |
| Arrow keys | Move focus through the grid |
| Space / Enter | Activate the focused tile or seal |
| 1 / 0 / X | Ink, clear or mark the focused tile pale |
| Backspace / Delete | Clear the focused tile |
| Z | Undo the previous mark |
| Escape | Close a panel or return to the folios |
| Gamepad | D-pad moves focus; A cycles, X marks pale, LB undoes, Y opens Rules |
Tips for Mobiriti
- Start with zero A zero seal forces each adjacent, unnumbered exit to become a night stone.
- Trace all turns A seal counts reachable floor around corners, not just tiles in straight lines.
- Use pale marks as notes The dark pattern alone finishes a chart, so you can leave certain pale tiles undecided.
The rules follow Naoki Inaba's original worked example: other seals block a walk and neither they nor the seal itself are counted. All 160 original charts have one exact answer and independently checked no-guess traces. Private witnesses never ship. Progress uses morass.mobiriti.v1. First-clear times rank only once; replays are practice. No ads or analytics run inside the game.
Watch how to play
About Mobiriti
In a moonlit chamber, brass seals guard a pale stone floor. Some tiles must become night stones, and each seal's number tells how much empty floor it can reach.
All 160 original charts are open across four shelves. Each compact clue set has one independently proved answer and a deduction path that needs no guess. Tap a seal to inspect its currently reachable floor without revealing the answer.
Your first clear time stays with the chart. An uninterrupted first clear on the game page can claim the verified best time shown on the chart card.
