Unlock hidden Costumes:
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While playing „Frogger: Helmet Chaos” with one of the following GBA
games in the second cartrige slot you will unlock hidden costumes
in the „Costumes” menu.
With „Frogger’s Journey:
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The Forgotten Relic” you get the „Punk Costume”
With „Frogger’s Adventures 2:
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The Lost Wand” you get the „Pirate Costume”