by 
Stakaya
ANSWERS: 2
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after the last battle in hollow Bastion which should be against Behemoth after the battle go and talk 3 the princesses then u should be able 2 lock the world
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Once you've returned to Hollow Bastion, go back to where you fought Riku and jump through the hole. Here you will have to beat behemoth (he's easy - lock onto his horn, run around to his bum, jump on his back, climb up to his horn and launch a special attack) then you can close the keyhole.
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