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This is a classic psychology experiment, and always fun and challenging to do. It'd be nice if there were a countdown clock to show how much time you have left (to add urgency in particular) and maybe some statistics at the end to say how long your average selection took per level, maybe also categorizing clicks for same color-word and different color-word. But I'm a data junkie like that.

Well thank you for your ideas, I will think about them. :)