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Think of some of the worst games you've ever played. Don't go by critical or commercial success; pick a game that you personally find terrible and make it good.
I'll begin:
Sonic The Hedgehog (2006)
Actually test run the game!
Get rid of the pointless side characters
No humans except Robotnik (Eggman.. whatever) NO EXCEPTIONS!!!
Make it closer to the 2D roots
Actually test each facet of the game for glitches, quirks and anything that makes it unplayable
The butterflies from this game becoming a success may colonise Antarctica