How to play
- Goal
- Shade cells so each numbered circle equals the total size of the shaded groups touching it by an edge.
- How it ends
- A chart is solved when every numbered circle is correct; there is no loss state.
- Record
- The fastest first solve of each chart is kept as a public record, with its holder's name.
- Tap a free tile to shade or clear it. Edge-touching dark tiles form one pool. Each numbered ivory seal stays pale and counts the total size of the distinct dark pools touching it by an edge.
- A pool touching two sides of the same seal counts only once. The worked picture joins a third shaded tile to a pool that touches both sides. Each seal shows its current count beside its target: jade is exact and red is over. A zero seal needs no touching dark tiles.
- Leave unused tiles blank; no X marks or Check button are needed. Undo restores a move. Restart clears ink without resetting the first-opening clock. A chart completes automatically when every seal agrees; there is no loss state. Replays are untimed practice. Returning to the atlas in the same page keeps the clock and public record chance; reloading an unfinished chart preserves its marks but makes its first finish local only.
Controls
| Tap / click a free tile | Shade or clear one ink tile |
|---|---|
| Tap / click a numbered seal | Highlight its touching pools and read its current count |
| Arrow keys | Move focus through the chart |
| Space / Enter | Toggle a focused free tile |
| Undo / Z | Restore the previous shading |
| Restart | Clear all shades without resetting the first clock |
| Escape | Close a panel or return to the atlas |
Every fixed chart has one independently verified answer and an elementary deduction trace; at least one clue is necessary on each chart. Private witnesses do not ship. Saves use morass.kurotto.v1; sound follows the shared site setting. No ads or analytics run inside the game.
About Kurotto
In an Orenvalt ink archive, shade violet tiles on bronze survey plates. Ivory numbered seals measure the size of each dark pool that touches them.
Explore 160 original charts across four open shelves. An independent exhaustive verifier found one answer per chart, and each chart has a forced-deduction route.
Your first finish time stays in this browser. An uninterrupted first solve can claim the named public best shown on each chart card.
