Puzzle types
The rules of every puzzle on the site, each with pictures of what works and what doesn’t, and a worked example.
Lines
Shading
- AquariumFill the outlined tanks with water that settles level; the numbers count the water in each row and column.
- Nonogramalso Picture Squares, Griddlers, Paint by Numbers, PicrossShade the cells the numbers ask for to uncover a hidden picture.
- Wittgenstein Briquetalso Desk PlacePlace straight blocks of three; numbers count block cells beside them, and the rest stays connected.
Numbers
- Easy as ABCalso Letterraam, End ViewPut each letter once in every row and column; letters outside are the first one seen.
- Irregular Sudokualso Jigsaw SudokuA sudoku whose boxes are odd shapes: every row, column and outlined area has each digit once.
- Skyscrapersalso TowersFill in building heights; the numbers outside count the buildings you can see.
- SudokuFill the grid so every row, column and box has each digit once.
- Thermo SudokuA sudoku whose digits rise along each thermometer, from the bulb to the tip.