Sudoku Variants

These pages hold sudoku with extra rules or shapes. Diagonal and hyper sudoku add regions, jigsaw uses irregular regions, killer sudoku uses cage totals, and Samurai joins five overlapping grids.

How to choose: if you already enjoy standard sudoku, start with diagonal or hyper sudoku, which keep the 9x9 grid and add extra regions to satisfy. Jigsaw sudoku replaces the square boxes with irregular shapes, so the usual box scanning no longer works. Killer sudoku removes most printed digits and relies on cage totals, so it suits people who like arithmetic with their logic. Samurai links five grids and takes the longest to finish. Each variant page lets you play on screen with hints or print a set with answers.

Tools in this group

• Hyper Sudoku (Windoku) — Sudoku with four extra 3x3 windows. Play on screen, print a set, or solve your own puzzle.
• Jigsaw Sudoku — Sudoku with irregular regions instead of boxes. Play on screen or print a set with answers.
• Killer Sudoku — Play killer sudoku with cage totals on screen, with a helper that lists the digit sets for each cage, or print a set.
• Samurai Sudoku — Five overlapping sudoku grids in one puzzle. Play it on screen or print it with the answer.
• Sudoku X Solver and Diagonal Sudoku — Type a diagonal sudoku to solve it step by step, or play and print new ones.