Shading Logic Puzzles

In these puzzles you shade or fill cells by clues. Rules differ: some use numbers in rooms, some count visible cells or neighbours, and some need the shaded cells to stay connected or apart.

Tools in this group

• Aquarium Puzzle — Fill the tanks with water so each row and column holds its number of water cells; water in a tank is always level.
• Heyawake — Shade cells so every numbered room holds that many, shaded cells never touch, and the white cells stay connected.
• Hitori — Shade cells so no number repeats in a row or column; shaded cells never touch and the rest stays connected.
• Kakurasu — Shade cells so every row and column adds up to its target; each shaded cell is worth its column or row number.
• Kurodoko (Kuromasu) — Shade cells so each number equals the white cells it can see in its row and column, itself included.
• LITS Puzzle — Shade one L, I, T or S tetromino in every region so all shaded cells connect and no two equal shapes touch.
• Mosaic Puzzle — Fill the cells so every digit counts the filled cells in its 3x3 block, its own cell included.
• Norinori — Shade exactly two cells in every region so that the shaded cells form dominoes, and dominoes never touch along an edge.
• Nurikabe — Shade a connected wall so every number sits in an island of exactly that many cells, with no 2×2 block of wall.
• Tapa Puzzle — Shade one connected wall; the numbers in a clue are the lengths of the shaded runs around it.
• Thermometer Puzzle — Fill the thermometers from their bulbs so every row and column holds as many filled cells as its number.