Here you have to master the art, in fact, be able to double figures again, but who has this little mathematical cliff managed ;-) who is rewarded with a real addictive game. Minimal graphics, zero squeaky noises, no giggling vegetables, no, purist fun. And who has finally reached 2048, which also wants to double it (the you can now even calculate time * g *), so I've not yet done, but I play the since autumn and am always still there, and that's what to say because I'm not very persevering when bored me what. Full marks!
