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Dragon Buster - Raise Vitality
At the Dragon Buster title screen press Select 10 times then start the game. When your vitality drops to 32 or below, press L1 + R1. Your vitality will rise to 128 and you will lose one credit.
Extra Credits
In any game, press SELECT while playing to gain an extra credit.
Grobda - Level Select
When the Grobda title screen appears, hold L1 + L2 + R1 + R2 then press Start.