Puzzle Games
generate · play · solve

Pick a Puzzle

Every puzzle is auto-generated fresh — no two games are the same. Choose your game, set the difficulty, and start playing instantly.

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Sudoku
rows · columns · boxes
4×4 6×6 9×9 12×12
Fill the grid so every row, column and box contains each digit exactly once. Four grid sizes from beginner 4×4 to expert 12×12.
Easy → Devilish 4 grid sizes Step-by-step solver
▶ Play Sudoku
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Calcudoku
cage arithmetic · deduce
4×4 6×6 7×7 8×8 9×9
Each cage must reach its target using the given operation. Try Operators Hidden mode — the hardest variant where you must deduce both the digits and the operation.
4 operator modes Hidden ops 5 grid sizes
▶ Play Calcudoku
☠️
Killer Sudoku
cage sums · no operators
9×9
Standard Sudoku rules plus cage constraints — digits within each dotted cage must be unique and sum to the cage's target. No operations given.
Easy → Devilish Unique cage digits Solver included
▶ Play Killer Sudoku
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Number Snake
connect the numbers · find the path
5×5 6×6 7×7 8×8 9×9 10×10
Fill in the missing numbers so that 1, 2, 3 … N form a connected chain. Each number must touch the next — sides and corners both count. Also includes Orthogonal where only sides count.
Easy → Devilish Number Snake + Orthogonal Step-by-step solver
▶ Play Number Snake
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Futoshiki
fill the grid · satisfy the arrows
4×4 5×5 6×6 7×7
Place numbers 1–N so every row and column holds each number once. The arrows between cells tell you which neighbour is bigger — the arrow always points from the larger to the smaller number.
Easy → Devilish Pencil notes Step-by-step solver
▶ Play Futoshiki
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Magic Sum
fill the grid · hit every total
3×3 3×4 4×4 3×5 4×5
Place every number from 1 to N exactly once in the grid. The blue totals at the edge of each row and column are your targets — every row and column has its own individual sum to hit.
Easy → Devilish 5 grid shapes Step-by-step solver
▶ Play Magic Sum
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Kakuro
cross-sum puzzle · fill the runs
6×6 8×8 10×10 12×12
Fill white cells with digits 1–9 so each run of cells reaches its clue total. No digit may repeat within a single run. The cross-sum classic — harder than it looks.
Easy → Devilish Pencil notes Step-by-step solver
▶ Play Kakuro

Every Game Includes

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TimerTrack your solve time. Pause and resume any time.
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Pencil NotesMark candidate digits in any cell. Auto-clears on entry.
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EraseClear a cell or wipe notes instantly.
↩
UndoStep back through every move. Ctrl+Z works too.
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Force HintPlaces one forced digit — a cell with only one valid candidate.
✓
CheckHighlights errors in red without revealing the solution.
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HistoryEvery move is logged. Tap any entry to replay from that point.
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Solver LinkStuck? Open the step-by-step solver for the same puzzle type.