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Alien Vs Predator
Level select:
Hold L + R + X + A on controller two, then press Start on controller one at the options menu.
Unlimited lives:
Press X, A, Y(2), A, Y, X at the "Start" menu.
Invincibility:
Press X, Y(3), B(2), X, A, B at the "Start" menu.
No enemies:
Press X(2), A, B, Y, A, Y(2) at the "Start" menu.
One hit kills:
Press X(5), Y, B(2), A, B, A, B at the "Start" menu.
At the end of level 1-1 you will meet up with the Boss alien of the sewage area. After a fast eight or nine seconds of the alien being submerged, hold down your laser button. When he rises from the aquatic sludge, turn in his direction and release the button.