The (well) known puzzle CalcuDoku, K-Doku, kenken. Features: Generate puzzles of different sizes and levels; Generate puzzles in the background while you play; Printing puzzles or complete books of puzzles; Custom puzzles; Save/load puzzles to file.

CalcuDoku Features:
1. Generate puzzles of different sizes and levels
2. Generate puzzles in background
3. Printing puzzles, or complete books of puzzles
4. Custom puzzles

The license of this software is Freeware, you can free download and free use this sudoku game software.