These need to be entered on the title screen.
Here are instructions for use of the individual password's features:
Level/Stage Select Code: Press 'Up' to advance individual stages, and down to regress individual stages, and through levels. Press start to play the selected stage
Sound Test: Press B to advance sounds, A to play. Press 'Start' to return to the title screen
Enable Weapon Select: In man-mode, pause and press Up to select between Gun 1 once, and Gun 2 twice. In the Dino, pause and press Down to select a weapon. You may enter another password after entering this one.
Enemy Viewer Mode: Press Up and Down after entering the code, and you can view the different enemies. Press 'Start' to return to the title screen
Effect Password Enable Weapon Select 8708 Enemy Viewer Mode 7777 Level/Stage Select 0916 Sound Test 1965 View Ending 9425
Contributed By: ugetab.
Effect Password Level 1 8547 Level 2 5431 Level 3 9892 Level 4 6315 Level 5 7452 Level 6 1697 Level 7 6425 Preview Code 7777
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