Clear Garden on Easy (Default). [No Codes]
Clear Pond on Easy (Default). [No Codes]
Clear Maze on Easy (Default). [No Codes]
Clear Machine Room on Easy (Default). [No Codes]
Clear Office on Easy (Default). [No Codes]
Clear Construction on Easy (Default). [No Codes]
Clear Duct on Easy (Default). [No Codes]
Clear Water Room on Easy (Default). [No Codes]
Clear Computer Room on Easy (Default). [No Codes]
Clear Roof Top on Easy (Default). [No Codes]
Reach the Exit in Garden on Super Hard (New Game Plus or Debug Mode). [Stage Select OK]
Reach the Exit in Pond on Super Hard (New Game Plus or Debug Mode). [Stage Select OK]
Reach the Exit in Maze on Super Hard (New Game Plus or Debug Mode). [Stage Select OK]
Reach the Boss in Machine Room on Super Hard (New Game Plus or Debug Mode). [Stage Select OK]
Reach the Exit in Office on Super Hard (New Game Plus or Debug Mode). [Stage Select OK]
Reach the Exit in Construction on Super Hard (New Game Plus or Debug Mode). [Stage Select OK]
Reach the Boss in Duct on Super Hard (New Game Plus or Debug Mode). [Stage Select OK]
Reach the Exit in Water Room on Super Hard (New Game Plus or Debug Mode). [Stage Select OK]
Reach the Exit in Computer Room on Super Hard (New Game Plus or Debug Mode). [Stage Select OK]
Reach the Boss on Roof Top on Super Hard (New Game Plus or Debug Mode). [Stage Select OK]
Have 999 Ammo for the M16 Assault Rifle on any difficulty.
Have 999 Ammo for the MP5 Machine Gun on Normal or higher difficulty.
Have 50 or more Ammo for the Grenade Launcher on Hard or higher difficulty.
Get the Flamethrower on Super Hard.
Use Medi Kits or alternative resources 5 times to heal your wounds without losing a Continue.
Get 3 Ballistic Vests without losing a Continue.
Have every Weapon at least once in one Continue.
Unlock the Debug Mode by pressing UP, UP, LEFT, LEFT, LEFT, DOWN, START on Title Screen.
Reach the Exit in Maze on Hard or higher difficulty in under 3 minutes. [Stage Select OK]
Clear a Stage on Hard or higher difficulty without picking up any Weapon. [Stage Select OK] [Restart level if you pick up a weapon]