Much more than just ordinary Sudokus. This ensures great diversion and fun.
The original classic from Japan
Sudokus with irregular regions
Sudokus with additional regions
Sudoku with colored cells
Sudokus with two diagonal regions
Sudokus with additional "sum cages"
Sudoku with black and white spots giving additional hints
Sudokus with relations to neighbouring cells
Sudoku with sums of the border cells
Sudokus with sums of several 2x2 cell regions
Several overlapping Sudokus forming one big puzzle
Sudoku in star shape and triangular blocks
Sudoku on a chess board: The cells have the eyes of the Queen
Sudoku with irregular or additional (colored) regions
Sudokus in sizes 4x4 up to 25x25