Mac 'pick up and play' games?

Mar 15, 2003
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I'm hardly a gamer but have really been enjoying using an emulator lately - something about blasting a platformer or 90s fighter for 20 minutes helps burn off stress. I'm not a fan of modern games that really pull you in for hours and have complicated maps and missions, I really just like playing for a few and moving on with my day. Any recommendations? I'm using a macbook air and imac, so modest gpu requirements please.

Thanks!