It is a topic-based "question/answer" game where answering a "knowledge" question leads to asking a new question within the same topic-category, but the next question must be based on part of your answer.

How to Play
To join in, just go to Why Is The Sky Blue, then the Brain Drain thread. There you can leave your name and have a look at the rules.

This should appeal to anyone who likes a bit of a challenge and enjoys learning about all sorts of different subjects.

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I feel like I'm diagonally parked in a parallel universe.