AppAdvice - Trappped ($2.99) by Hyperbolic Magnetism is a tricky puzzle game that is sure to delight. If you’re a fan of sliding puzzles, similar to the vein of Trainyard, but want a much more challenging game, then this is one to pick up.
Trappped is a game about a game that's trapped inside a game. It's up to you to solve a series of lock puzzles, sliding coloured squares into place in order to let the incarcerated program back to safety.