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As far as compulsive time wasters on the App Store are concerned, Doodle God is a new favorite.
The game is a silly puzzler, in which various elements are combined to create new elements. Some of the puzzle logic is hysterically (and frustratingly) wonky: the combination of “Life” and “Rock” results in “Egg,” for example. Successfully bond two elements together and you’re given a new building block to play with, as well as a pithy, oft-times humorous philosophical quote.
I’ve really been enjoying the game, inscrutable though it sometimes may be. If you’re interested in trying it before you buy, there’s a great Flash version, or you can pick it up on the App Store for just $0.99.