The Little Crane That Could is a free app, developed by Abraham Stolk, which places players in control of a mobile crane. The basic premise is to use the crane to solve puzzles and progress through the levels, with the free version offering six levels and the premium paid upgrade adding a further 21 levels to the collection. Although the graphics are fairly basic and the controls provide a steep learning curve, the game does include excellent variety. It also makes use of a realistic physics engine and comes complete with a helpful in-game tutorial.
