There are six single-player training exercises, as well as four games for recreation, one for wireless services.[citation needed] The single-player training exercises are: Missing Letter, Split Decision, Word Shuffle, Pasta Letters, Block Letters, and Safecracker.[3] These four recreation games are: Competition, Cube Panic, Speed Letters, and Multi-Card Play. In addition, there are three difficulties: Easy, Medium, and Hard. All games initially only have their Easy difficulty available, with harder difficulties unlocked over time.[citation needed]