About Yonmasu
At a moonlit cartographer's table, each circle is a moonstone waiting for a four-cell constellation. Claim the glass tiles around it until the whole mosaic is divided.
Explore 180 original charts, sixty each on 5×5, 6×6 and 7×7 grids. Each puzzle has one solution.
The clock starts when a chart opens. An uninterrupted first solve can set the best time, shown with its holder on every atlas card and beside the clock.
How to play
- Goal
- Divide every open cell into connected four-cell regions, with exactly one circle in each region.
- How it ends
- A chart is complete when every open cell belongs to one valid region; there is no loss.
- Record
- Your first solve time is kept per chart, and the fastest verified first solve appears with its holder.
- Divide every open cell into connected four-cell regions. Every region contains exactly one moonstone circle. The dark sealed cell, when present, belongs to no region. A square of four cells is legal; regions may take any connected shape. The worked picture shows one moonstone becoming a complete four-cell constellation.
- Tap a moonstone to select its region, then tap or drag across cells to claim them. Tap one of the selected region's cells again to clear it. Tapping a cell owned by another moonstone selects that region first. Use two fingers to pan a chart that is taller than the frame.
- Undo reverses a claim or stroke. Restart clears the chart while its clock continues. A chart finishes when all open cells form valid regions; there is no loss.
Controls
| Input | Action |
|---|---|
| Tap / click a moonstone | Select its four-cell region |
| Tap / click an open cell | Claim it for the selected moonstone; tap again to clear |
| Drag across cells | Claim cells in one stroke |
| Two-finger drag | Pan a chart larger than the frame |
| Right click a cell | Clear it |
| Arrow keys | Move focus through open cells |
| Enter / Space | Select or mark the focused cell |
| [ / ] | Cycle through moonstones |
| Delete / Backspace | Clear the focused cell |
| Z | Undo the last claim or stroke |
| R | Restart with confirmation |
| Escape | Close a panel or return to the atlas |
Good to know
The circle rule adds alternatives when removed. First-solve progress and reduced motion save in this browser; only an uninterrupted first session can set a record.
