Mach 3
Cheat Codes:
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For invulnerability in this game, use the DOS utility DEBUG.
First backup your game to be edited, then type the following
from the DOS prompt:
ren mach3.ov2 cheater.cht
debug cheater.cht
e 261f 90
Then type: w
q
Then rename CHEATER.CHT back to its previous name.