via http://pdroms.de/
Sudoku4Kids by Mincemeat TEAM is a game for kids that generates a single quadrant Sudoku, choosing from 4 x 4, 5 x 5 and 6 x 6. Implements an algorithm for calculating Sudokus go randomly, so the number has to solve Sudokus is unlimited.
http://mincemeatteam.eshost.es/index.htm
