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What is your favorite obscure Retro Game?
(i.imgur.com)
Mine is Lady Sia for GBA. It's just a platformer but I just love it played and completed more 20 times. Will probably speedrun it in future.
Crush for PSP, it's a puzzle game where you switch between 2d and 3d. The style is cartoony, the music is amazing, and the puzzles are generally engaging without being too difficult. It's really a shame it only came out for PSP and a slightly different version on 3ds.
https://en.wikipedia.org/wiki/Crush_(video_game)