Quokka Studios Pty Ltd has Strimko (iTunes Link) in the iTunes App Store for FREE for a limited time.

STRIMKO™, the popular web-based logical puzzle game, comes to the iPhone / iPod touch, so you can play on the move. Strimko is a number puzzle that introduces a new twist on the classic Latin Squares concept described by the famous Swiss mathematician Leonhard Euler (1707 – 1783) and popularised in forms such as Sudoku and similar number puzzles.

Strimko puzzles are all hand-crafted, tested and difficulty graded by experienced puzzle composers to provide a continuing challenge and attractive puzzle designs. Once you’ve played hand-crafted puzzles, you’ll never want to play mass-produced computer-generated puzzles again.