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Sony PSP - Rengoku 2: The Stairway To H.E.A.V.E.N. cheats

H.E.A.V.E.N.-A, -B and -C:
Beat Gryphus boss in level 8. Then, re-enter Level zero (Primordium) after 
the intermission sequence and go to the door behind you.

Highest H.E.A.V.E.N. floor:
Finish all 99 H.E.A.V.E.N. stages.