AI Sudoku is a brand name for difficult and challenging sudoku puzzles. The valid rating method guarantees, that the rate of correct difficulty level can be assessed by the logical rules.

The sudoku generator developed by the doctor of science in the applied mathematics, Arto Inkala, used all known solving techniques. There has been rated more than milliard puzzles by fast rating algorithm and by the huge computing capacity also the most difficult sudoku (AI escargot) in the world has been found in the autumn 2006.