Mission objectives vary in quantity and length depending on the difficulty setting chosen. Difficulty settings also affect enemy accuracy and damage, and the availability of the game's optional automatic aiming assistance. The player can use several weapons, including pistols, submachine guns, assault rifles, a shotgun, a sniper rifle, and a rocket launcher. Weapons must be reloaded after a certain number of shots and have alternate fire modes. For example, the Wolfram P2K can be used with or without a silencer. In addition, the player always carries a wristwatch which may be used to stun enemies, fire tranquilizer darts, throw a grappling hook, or emit a laser beam to open locks. In some missions, the player can also use night vision or X-ray vision glasses to outsmart enemies. The player has a certain amount of health which decreases when attacked by enemies. There are no health-recovery items in the game, although body armors can be acquired to provide a secondary health bar. A Nintendo 64 Controller Pak is required to save the player's progress through the game.