Lightbringers by Frima Studios is an RPG that’s playable through your browser on the web, through the Facebook interface and now, on the iOS as well as Android platforms. I played it on the iOS platform on an iPad3. It will not run on the iPad2 or the iPad Mini (same processor as the iPad2, smaller screen). Frima is well aware of the demands of the game as the first tip you see when you boot up the game is to shut down all other apps and use WiFi instead of 3-G.
Read more of Carolyn Koh's Lightbringers: Fun & Balanced But Tied to Your Wi-Fi.