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They aren't for everyone, but the GROW series of games are among the most entertaining online inventions I've ever had the pleasure of playing.

The premise is pretty simple: You are given a field and a set of buttons. Each turn, you choose a button and watch how it affects the field. The different objects interact with each other and grow off one another. Through trial and error and a skewed smidgen of logic, you can determine the correct order to click the buttons in, completing the...