Just when you thought it was safe to pick up a pencil Killer Su Doku is based on the original Su Doku grid, with the same rules and numbers—1 to 9—but with

Killer Su Doku poses an even greater challenge than the Fiendish Su Doku puzzles.Here are 100 previously unpublished puzzles for hard-core Su Doku addicts.

Game & Puzzle Design is a peer-reviewed research journal publishing high quality work on all aspects of game and puzzle design. The journal is published twice a

This treasure trove of resources is divided into ten themed sections, each preceded by an outline giving the key principles, links with curriculum guidelines an