Hi TouchArcade! We are a game development team and we'd appreciate your input. We're trying to develop a game and we need help choosing between these two game concepts. Both of them will have very simple controls. 1) A two player cooperative puzzle-based dungeon crawler with rogue-like elements 2) A two player competitive shoot 'em up with random power-ups like Mario Kart. You can read more about these two concepts here: https://dl.dropboxusercontent.com/u/19120741/Files/PiStudios%20-%20High%20Concepts.pdf Also, please tell us what your favorite iOS game is! Thank you for taking the time to reply, any other feedback is much appreciated.