4. Trials HD
More so than its successor, Trials Evolution, Red Lynx's original 2D cycle 'em up had some pretty outrageous challenges. Earlier levels aren't much of an issue and the skill games are simple enough once you get the hang of them, but the later levels are absolutely unholy. Barely completable at all, anyone who can get a gold on Inferno 2 deserves your ultimate respect and admiration.
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