hyper, even/odd, samurai....

On http://www.sudoku-space.com/ you can play sudoku's, sudoku-x's, stairstep sudoku's

hyper sudoku's and win sudoku's online.

There are daily pdf-files to print (also a daily pdf file with 3 samurai sudoku's)

Sudoku variants

Goto http://www.hexapuzzle.hu/sudokuvariants/ for these strange sudoku variants

There are samples and a 'how to solve' page