Puzzle games. Possibly the most unloved genre. It's a close call between them and pet simulators (oh wow, another list idea!). Sometimes though, the zone-out tension of a puzzle game is what you need. It's what I needed at least. Here's some I like.
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Surely it must win an award for the least use of a modern gfx card ever? Some lines, some circles, some red, some blue and you're done. Crazy fun though and educational too!
A pretty good puzzler made all the better with a surprisingly good story on top. Japanese hipsterism represent!
Almost single-handedly made my PSP worth owning.