Japanese logic puzzles, free online
Sudoku is only the best known: Japanese publishers, Nikoli first among them, created dozens of logic puzzles on the same principle: a grid, short rules, a single solution you can find without ever guessing.
Play them all here, free, with no ads and no sign-up, and a fresh grid every game.
Play nowThe games (14)
- Classic Sudoku
- Classic 9 × 9 sudoku online, free: every grid has a single solution, from easy grids solved with simple deductions to expert ones that take more.
- Kakuro
- Kakuro, the crossword with digits: fill each run of cells so it adds up to its clue, without repeating a digit.
- Nonogram
- Nonogram (picross, griddlers): use the numbers on the edges to fill in the cells and reveal the hidden picture.
- Bridges
- Hashiwokakero (Bridges): connect the islands with bridges, without crossings, matching the number on each island.
- Binary
- Takuzu (binairo): fill the grid with 0s and 1s while following three simple rules. An addictive logic puzzle.
- Light Bulbs
- Light Up (Akari): place light bulbs so that every white cell is lit, without two bulbs seeing each other.
- Rectangles
- Shikaku: split the grid into rectangles, each containing exactly one number equal to its area. A tidy logic puzzle.
- Hitori
- Hitori: shade cells so that no number repeats, with no two shaded cells touching and without cutting the grid apart. A pure-logic Japanese puzzle.
- Islands
- Islands: shade the sea around the islands, each number gives the size of its island. The Japanese logic puzzle Nurikabe, online and free.
- Calcudoku
- Calcudoku (KenKen): a Latin square whose cells are grouped into cages showing a result and an operation. Mental arithmetic and logic, with a single solution.
- Inequalities
- Futoshiki, the inequality sudoku: each digit once per row and column, respecting the < and > signs between cells. Grids from 4 × 4 to 6 × 6.
- Skyscrapers
- Skyscrapers, the logic puzzle: place buildings of different heights while respecting how many you can see from each edge.
- Crowns
- Crowns, the queens logic puzzle: one crown per row, column and colour zone, and no two crowns may touch. Pure deduction.
- Tents
- Tents and Trees: pitch one tent next to each tree, using the counts on the edges. A relaxing logic puzzle.
Their original names
Bridges is Hashiwokakero (Hashi), Binary is Takuzu (Binairo), Nonogram is Picross, Light Bulbs is Akari (Light Up), Rectangles is Shikaku, Islands is Nurikabe, Inequalities is Futoshiki.
Where to start?
Takuzu and Shikaku have the shortest rules; Hashi and Akari come next. Kakuro and Hitori take a little more practice. Every game has an easy level to learn.
FAQ
Does every grid have a single solution?
Yes, each grid is checked when it is built: one solution, reachable by deduction.
Do I need to know the rules?
No: each game explains its rules in a few lines before you play.