I don' t know about you, but I'm a little bored by Sudoku. Once you figure it out it's just a matter of going through the paces to solve it. It just gets to be a matter of how fast you can get them done. But, there are other number puzzle games out there. This one, Futoshiki is a similar number game, but faster to play and more interesting.
The idea of Futoshiki is that you have a 4x4 or 5x5 grid. Each row and column must have the numbers 1-4 (or 1-5 for a 5x5 game) only once. In addition there are arrows on the board that signify when an adjoining cell must be greater than the other. Futoshiki includes 12,000 different puzzles -- should keep me busy for a couple days.
This version does a good job and provides good customization options. If you like Sudoku but are looking for something different, try this. I think you'll like it.