The codes.
Press and hold the keys Z E U S to go into god
mode. While in god mode you can use the G key
to toggle gravity.
Press and hold together the keys X T R A to get
some ammo, but this works only once during the game.
To go to another level press and hold together the
keys N E X T then enter a number from 1 to 10.
You may have to release the R key first in XTRA
and the X key first in NEXT in some versions.
