Hard Core

CheatMode:
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At the options screen type these codes:
Code     Result
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CHANGE   - SWITCH TANK
RETURN   - SWITCH TANK
ENERGY   - INFINITE CRYSTALS
GRAVITY - LOW GRAVITY
HEAVY   - HIGH GRAVITY
NORMAL   - NORMAL GRAVITY
SKIP1   - SKIP 1 LEVEL
SKIP2   - SKIP 10 LEVELS
EASYKEY - GET THE KEY
DARKNESS - NO LIGHT
BLEAK   - HEAVY FOG
MANIC   - GO FAST
REFLECT - TANK REFLECTS
RAPID   - RAPID FIRE
BOMBS   - FIRE BOMBS