Puzzles for people who don't want it easy.

Big books of Sudoku, Calcudoku, Futoshiki, Hashi and more, graded from novice to properly hard.

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Hard Sudoku. Solve it on screen or print it out. No signup needed, and the solution is one click away.

2000 puzzles per book, 8.5 x 11 in. Classic 9x9 logic, plus giant grids and merged multi-grid variants.

200 puzzles , 8.5 x 11 in. Connect the islands with bridges. Every number must be satisfied.

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16 puzzles , 8.5 x 11 in. Classic 9x9 logic, plus giant grids and merged multi-grid variants.

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600 puzzles per book, 8.5 x 11 in. Fill the grid so every cage hits its target using + − × ÷.

1000+ puzzles per book, 8.5 x 11 in. Sudoku with cages and sums. Arithmetic and logic at the same time.

240 puzzles per book, 8.5 x 11 in. Classic 9x9 logic, plus giant grids and merged multi-grid variants.

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