Six that I can recall, all with Spark Plug Games (This doesn't count lite versions)-- 1. iSlap 2. DQ Craze 3. Witch's Workshop 4. Aya Go 5. Lost in Time: T

Six that I can recall, all with Spark Plug Games (This doesn't count lite versions)-- 1. iSlap 2. DQ Craze 3. Witch's Workshop 4. Aya Go 5. Lost in Time: The Clockwork Tower 6. Puzzle Quest 2