If you like Calcudoku puzzles (i.e. Sudoku plus math), you might enjoy Patrick Min’s site. It’s updated with new puzzles regularly, and includes some interesting variants, such as multicell division and subtraction, modulo operators, 10×10 and larger puzzles.
Incidentally, my solver can’t handle all those options – it only goes up to 9×9, for one thing – but if there’s demand, I’ll see about adding those features.
