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Ooh, this looks like a very interesting write-up of a thoughtful SXSW session. Marked as something I need to follow up on.
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"You don’t need to be able to lose for a game to be enjoyable or challenging. You just need to be able to fail." Some good notes on the purpose of failure in games, and how to sensibly work failure as a mechanic into games without irritating players.
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The Klein Four are "the premiere a capella group of the world of higher mathematics". Judging from this video: yes, so they are.