Strimko for the iphone!!

http://www.strimko.com/iphone/
The Grabarchuk Family: Serihy, Serihy Jr & Peter have consistently produced clever, fun puzzles. Their invention, Strimko, has taken the world by storm. Strimko is similar to Sudoku, but circles are linked together. Each set of links must contain different numbers while the entire grid forms a latin square.

$2 gets you 120 puzzles. That will keep you occupied for many hours - and less expensive than a movie.

Philiosophy: you can download a 'lite' or 'free' version. However, you don't get as many puzzles. Also, people should be rewarded for their efforts, right? Then they'll make more cool puzzles.