prototype

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http://www.gamasutra.com/view/feature/2438/how_to_prototype_a_game_in_under_7_.php

Making a game, world of goo creators

Here's a crazy game idea: Drag trash-talkin' gobs of goo to build a giant tower higher and higher. They squirm and giggle and climb upward over the backs of their brothers, but be careful! A constant battle against gravity, if you build a tower that's too unstable, it will all fall down.