How to play
- Goal
- Shade one connected island in every realm, keeping islands apart across borders and giving neighbouring realms different island sizes.
- How it ends
- The chart lights when every realm has an island and all border, size and clue rules hold; there is no loss.
- Record
- Your first solve time is kept for each chart, and the fastest verified first solve appears with its holder.
- Each thick bronze border outlines one realm. Shade at least one square in each realm; its shaded squares must join through shared edges. Islands in different realms cannot touch across a border, though diagonal corners may meet. A number gives that realm’s exact island size. Two realms sharing a border must have different island sizes. Pale sea squares do not need to connect. In real Chart 001, a shaded square at row 3 column 3 lies immediately left of a different realm. The worked picture marks the square across that border pale; the rest of the chart stays open.
- Tap a square to cycle island, pale note, blank. You may drag through several squares as one move, choose Shade or Pale for the selected square, or right click for a pale note. Pale notes help deduction but are not required for completion. Red edging shows a definite border, size, or connection problem.
- Give every realm one connected island, satisfy any number, keep islands apart across borders and make neighbouring island sizes unequal. Undo and Redo correct slips; Restart clears marks while the first clock continues. A first clear can rank once, and later clears are untimed practice.
Controls
| Tap / click a square | Cycle island, pale note and blank |
|---|---|
| Drag across squares | Paint one colour through several squares as one Undo step |
| Shade / Pale / Erase | Apply a mark to the selected square or clear it |
| Right click | Mark a square pale |
| Arrow keys | Move across the chart |
| Enter / Space | Cycle the focused square |
| W / S or X / Delete | Shade, mark pale or erase the focused square |
| Undo / Z; Redo / Shift+Z | Step backward or forward through edits |
| Restart / R | Clear marks without resetting the first clock |
| Escape | Close a panel or return to the charts |
| Gamepad | D-pad moves; A cycles, X marks pale, Y erases, LB/RB undo/redo |
Tips for Shimaguni
- Read the bronze seam An island square makes every directly touching square across a realm border pale.
- Compare island sizes If a neighbour is already a three-square island, this realm must finish with another size.
- Grow one shore Squares inside a realm may touch along edges; two separate dark groups must still be joined.
All 160 fixed charts have distinct region layouts, one exact answer and an independently checked no-guess deduction trace. Private witnesses never ship. Progress uses morass.shimaguni.v1. Only the first clear can rank; replays are practice. Sound follows the shared arcade settings. No ads or analytics run inside the game.
Watch how to play
About Shimaguni
An enchanted archipelago is divided into bronze-edged realms. Restore one green island inside each realm without letting two islands meet across a border.
All 160 charts are open from the start. Their unique answers and no-guess deduction paths were checked independently; the four reaches range from compact five-by-five charts to seven-by-seven wards.
Your first solve time stays with each chart. An uninterrupted first clear on the game page can claim the named best; later replays are practice.
