"You don't even need to succumb to Noby Noby Boy's many surface charms to appreciate its genius. By some combination of cunning and magic, it makes you a child again. It helps you rediscover the bottomless fascination and joy you had in discovering the properties of string, or sand, or animals, or Newtonian physics for the very first time. It makes you free to play, and happy to make your own entertainment, for hours on end.
And in case you're still unsure if it's for you - in case you were thinking of denying yourself a chance to feel like that again - let me say one more thing: it costs less than lunch."
http://www.eurogamer.net/articles/noby-noby-boy-review