Summary: Ugly interface!!! Can't use the pen and write the numbers, have to pick from a list of numbers. Very annoying... Very bad when comparing to the interface from Brain Age!!! I would return this game, but Amazon doesn't accept it if game is opened. If you think that this game has a good interface... you haven't tried Brain Age yet!!!!
Summary: It's a fun game with a few different sudoku puzzle options (classic, 8x8, 4x4, etc). I don't like how you have to input/erase/change the numbers into the boxes....expected it to be like the sudoku puzzles on the Brain Age games, but it's not even close.