Favorite Math Puzzles

It seems most people who love math also love logic and math puzzles. Anyone have any favorite puzzles. I hated the Sudoku puzzles, mostly because of the quick popularity, until I worked one. They are fun and addictive. I also like the logic puzzles that come in a triangular grid with clues. I used to work these in high school. Haven't come across many good puzzles in the last few years.

I have recently become addicted to Kakuro puzzles - I find them more fun than Sudoku. Anyone else tried these? I prefer to do them on paper, but you can play online for free at http://www.kakuroconquest.com/. I also subscribe to Games Magazine which has some interesting puzzles.

I tried this game. Not bad. Could definitely be addictive. Thanks for the link.