Scribblenauts- An amazing concept that lets you write down the name of an object and watch it appear in the game. This means you can request a huge variety of weapons to defeat enemies, name your preferred food (but not brand) to restore energy, and watch your favourite animals roam the land. You can also experiment by combining items, stacking them on top of each other and so on. Incredible, but true!
£24.99 in Game, Play, tell me if you can find cheaper!