Free logic puzzles,
solved by reasoning alone.
Pencil-and-paper logic puzzles rebuilt for the browser, most of them from the Japanese puzzle tradition. Sudoku and Kakuro are number placement, Nonograms paints a hidden picture from row and column clues, and Minesweeper asks you to read numbers to find every mine without setting one off.
The grid puzzles go further: Slitherlink draws one loop around numbered cells, Hashiwokakero links islands with bridges, Nurikabe and Hitori are about which cells to shade, and Queen Zones and Star Battle place pieces so that none of them touch. Calcudoku adds arithmetic cages to a Latin square.
The grid puzzles each have a single solution you can reach by deduction, so there is never a point where you have to guess. Sudoku comes in four difficulties with pencil notes and hints, and many of the others let you pick how hard a grid you want.
All 17 logic puzzles
- Logic
Sudoku
Nine by nine. One number per house.
- Logic
Minesweeper
Numbers don’t lie. Flags do.
- Logic
Queen Zones
One queen per row, column and color.
- Logic
Nonograms
Numbers along the edges. A picture hiding inside.
- Logic
Number Path
One line. Every cell. Numbers in order.
- Logic
Hashiwokakero
Numbered islands. Build bridges between them.
- Logic
Slitherlink
One closed loop. Numbers count its edges.
- Logic
Kakuro
Digits one to nine. Runs that sum.
- Logic
Sun and Moon
Suns and moons. Balance every row.
- Logic
Prism
Reflect light. Combine colors. Light every target.
- Logic
Nurikabe
Build islands. One continuous wall.
- Logic
Hitori
Shade cells so numbers don't repeat.
- Logic
Tents and Trees
One tent per tree. No two tents touching.
- Logic
Akari
Place bulbs. Light every cell. No bulb sees another.
- Logic
Calcudoku
Latin square meets arithmetic cages.
- Logic
Shikaku
Carve the grid into numbered rectangles.
- Logic
Star Battle
Two stars per row, column and cage.