AppSafari: Lost in Letters by Smugbit Studios is a simple find-a-symbol game. This app requires iOS 5.0 or better and can be played on iPhone 3GS or later, iPod Touch 3rd generation or later, and any of the iPads. There are four game modes with achievements and leaderboards but they require Game Center login. The difficulty levels are easy, normal, and hard. I think anyone can play this game but only a handful will stick with it.