Puzzle types
The rules of every puzzle on the site, each with pictures of what works and what doesn’t, and a worked example.
Shading
- Akarialso Light UpPlace light bulbs so every white cell is lit and no bulb shines on another.
- AquariumFill the outlined tanks with water that settles level; the numbers count the water in each row and column.
- Cavealso Corral, BagShade the rock around one connected cave; each number counts the cave cells it can see.
- HitoriShade cells so no number repeats in a row or column; shaded cells never touch, and the rest stay connected.
- MinesweeperEvery number counts the mines in the eight cells around it.
- Nonogramalso Picture Squares, Griddlers, Paint by Numbers, PicrossShade the cells the numbers ask for to uncover a hidden picture.
- Nurikabealso Islands in the StreamShade a winding wall so every number sits in a white island of exactly that size.
- Star Battlealso Two Not TouchPlace one star in every row, column and outlined area; stars never touch.
- Wittgenstein Briquetalso Desk PlacePlace straight blocks of three; numbers count block cells beside them, and the rest stays connected.