Deviously Impressive
An ingeniously twisted and well-designed game, with mercifully precise controls and a whole load of clever ideas. A couple of the early screens are a little obtuse in their solutions (specifically, the ones where you have to deduce which buttons do what), but once you're into the main body of the game it does a great job of gradually introducing new ways of traversing seemingly impassable areas, so that by the time you reach the gleefully tricky later levels you can always work out a logical solution. Top fun.