Cheat codes:
To get all power ups and extra lives:
1. On the high score screen, enter CLASSIFIED as a name
2. The entry will change to WRONG
3. Begin a new game

To get extra weapons:
Original Version
1. On the high score screen, enter Terminator (case-sensitive)
2. Begin a new game
Macho Version
1. On the high score screen, enter BlooDSporT (case-sensitive)
2. Begin a new game