The wonderful iPhone roguelike 100 Rogues is free today from the App Store. For those not fully acquainted with the title, it's a turn-based dungeon crawler with randomly generated maps, multiple classes and plenty of challenging monsters to keep you on your toes.

The idea is to see how far through the dungeon you can get on a single life, upgrading your weaponry and battling stronger enemies such at the Skybaby and the Gummy Rat. It's really marvellous fun, so make sure you grab it while it's free. It works on iPad too, of course!