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Get a final score of 1800 or greater on the "Normal" difficulty level.
Gigantor survives the battle
Finish all the levels... Oh, but that's JUST the levels!
Finish two thirds of the levels.
Finish one third of the levels.
eat a super rare Pineapple!
The end is upon you.
Destroy all the bugs.
Unlock the gate.
Fall through the clouds.