It's hard to find games that work on my iPhone 3GS without crashing, but Kairosoft always delivers! I've had none of the glitches reported on newer devices. (If you're familiar with iPhone games in general and Kairosoft in specific, not all of them support rotation, so that hardly counts as a "glitch".) Gameplay is a cross between GameDev and some of their "adventure" style games where you send your people on missions to gather resources and ideas. Quite engaging, but rather short compared to Ninja or Beastie. My favorite part is having a penguin, a polar bear, a chimp, and a robot on my staff. :D