How to play
- Goal
- Colour every square dusk or dawn so each colour forms one side-connected region and no 2×2 block is all one colour.
- How it ends
- A chart is won when every square is coloured and all three rules hold; there is no loss.
- Record
- Your first finish time is saved for each chart, and an uninterrupted first solve can set its named public best time.
- Colour every square dusk or dawn. Each colour must make one region connected through sides; touching at a corner does not join them. No 2×2 block may be entirely one colour. Printed circles stay fixed.
- The worked picture shows real Chart 001 before and after a forced dusk circle. Three dawn circles already occupy a 2×2 patch, so the fourth square cannot be dawn. Tap a blank once for dusk, again for dawn, and a third time to clear it; a right click reverses the cycle.
- A chart completes automatically when every square is coloured and both regions connect without a solid 2×2 block. Red shows a visible-rule conflict, never a mismatch with a hidden answer. Undo reverses a move and Restart clears entries without resetting the first clock. Replays are untimed practice; returning through this atlas keeps first-solve eligibility, while reloading unfinished progress makes that first solve local only.
Controls
| Tap / click a square | Cycle empty → dusk → dawn → empty |
|---|---|
| Right click a square | Cycle in reverse |
| Arrow keys | Move focus through the chart |
| 1 / 2 / Backspace | Place dusk, place dawn, or clear a focused square |
| Space / Enter | Cycle a focused square |
| Undo / Z | Restore the previous mark |
| Restart | Clear entries without resetting the first clock |
| Escape | Close a panel or return to the atlas |
All 160 fixed charts have one independently verified answer and a no-guess deduction trace. Removing either the connection rule or 2×2 rule makes every chart ambiguous. Private witnesses do not ship. Saves use morass.yin-yang.v1; sound follows the shared site setting. No ads or analytics run inside the game.
About Yin Yang
In a moonwell garden, place dusk and dawn circles until each colour joins into one side-connected region. Keep every 2×2 patch mixed.
All 160 original charts have one independently verified answer and a no-guess deduction path. Both connection and the 2×2 rule matter on every chart.
Your first finish time stays in this browser. An uninterrupted first solve can claim the named public best shown on each chart card.
