Unlock Triotos DX: Fight Haggleman Lady in VS Rival Mode
To access this feature you must clear VS Rival mode in under 15 minutes without using any 'Continues'. When you then defeat Haggleman you will go on to an additional secret stage that pits you against Haggleman Lady.
We have more cheats and tips for this game here, Game Center CX: Arino no Chousenjou 2 cheats
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