Don't let the name of the game fool you, you don't need to know chemistry to play this game (although it saves ou time checking the periodic table). The games is more about programming two small robots (waldos), ordering them to pick up and carry atoms around in a reactor to create new elements. It starts out pretty simple, but ramps up in difficulty pretty fast; the later worlds are fiendish. Despite being a puzzle-game, there is a fair amount of replayability as you try to make your solution betters. There's always more than one way to solve a puzzle, and the leaderboards give you a graphical representation of how you fare against other players in terms of efficiency of instructions and/or time: Trying to maximize one usually has a negative impact on the other. The only bad thing about the game, is that it really needs a version system for levels, so you can work on and save different solutions opitmized for various results.
