Mushroom Man is a puzzle game with terrible graphics, annoying sound effects, and really enraging levels.
It's also the best puzzle game I've ever played.
It's free, in-browser, uses flash. Share your progress in the comments, I will be impressed.
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30 levels in & this is still easy (compared to e.g. Chip's Challenge). But as for old Kongregate puzzle games, have you tried Chronotron? :)
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I made it past 50 levels in an hour (OJET) before getting bored, most of the puzzles are just counting resources. Try Hanano Puzzle by Qrostar ("Flower Puzzle"), it's way more fun and challenging!



