Alternate costumes:
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Successfully complete the game to unlock the Army and Battle costumes.
Successfully complete the game a second time to unlock the Ancient costume.
Grenade gun:
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Successfully complete the game three times. The grenade gun with unlimited
ammunition will be available at the start of the next game.
Operation: Wipe Out mode:
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Successfully complete the game with a time under 5: 00: 00.
Design Disc code:
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When at the part of the game where this sound is heard after pushing the
shelf, enter „367204” as a code.
Codes (DDK):
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The list of Codes I will mentiion are for opening the DDK Doors, the
letter it has means the Disks you need:
H-Head
N-Newcomer
L-Laboratory
E-Energy
W-Waterway
S-Stabilizer
D-Doctorkirk
Get Shotgun Culat:
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In Doctor Kirk Personal Lab, move the Boxes. The culat of the Shotgun
will appear there.