Mycroft65536 comments on How to test your mental performance at the moment? - Less Wrong
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I play a quick game of minesweeper on my phone. If I get a decent hard map solved in under 1 min I'm sharp. An easy map under 15 seconds. If i lose, I try and figure out if it was random or poor judgment. It's not as good as some other tests mentioned, but it's fast and mobile.