Puzzles

Logic puzzles generated by my own algorithms — solve on screen or print.

Nearly seven million puzzles — in every size and variant.

Sudoku with a twist.

Sudoku with letters — find the hidden word.

Sudoku in many box shapes — 2×3, 3×4, 4×4 and more.

Sudoku in three dimensions.

Greater-than sudoku: inequality signs instead of givens.

Crosswords with sums instead of words.

Divide the board into right-sized regions.

Shade cells until no number repeats.

Link number pairs without crossing lines.

Connect the islands with bridges.

Sudoku meets arithmetic.

Killer sudoku: sums instead of givens.

Hand-crafted sudokus with a hidden message.

Overlapping sudokus — shared boxes must satisfy both.

Find as many words as you can.

Find the words hiding in the grid.

Fill in 1–9 so the rows and columns match the sums.