checked-no =>Cheat Codes: To enter a cheat code, pause the game and press PAD: U D U D. The words "Enter Cheat Code" will appear on the screen, and you'll be able to enter one of the following codes. * Extra Armor: Press PAD: R L R D U R. * Invincibility: Press PAD: U R L D D U. =>Weapon Upgrades: Certain missions have hidden weapon upgrades. These upgrades will only work in the mission they are found in. * Mission 1: Parachute down to the west cliff and search near the boxes and searchlight. * Mission 2: On the counter inside a small building near the courtyard entrance. * Mission 6: Parachute down to the west tower and search the top floor. The tower is the one emitting greenish gas. * Mission 10: When inside the tunnels, look for the first 88 to appear. Check behind the boxes at the end of the first hall.