The puzzles in this collection of treacherously difficult puzzles will stretch even the most advanced Su Doku enthusiast. You will need to use all of your best

Warning: Not suitable for amateur puzzlers! Prepare yourself for the toughest Su Doku challenge there is. These diabolically difficult Ultimate Killer Su Doku p

Killer Su Doku poses an even greater challenge than the Fiendish Su Doku puzzles.Here are 100 previously unpublished puzzles for hard-core Su Doku addicts.

Holmes presents a collection of classic sudoku to support the mind in awesome shape. Very hard sudoku, excellent mental workout. KaKuro is a logical numerical p

Challenge yourself with this set of cryptic puzzles from the most famous crossword in the world compiled by the Times Crossword Editors. Following in the tradit