PS1 | Submitted by pooAll Levels Keys and Items
Use controller 2 at the World Map and press Circle, X, Triangle, Square, Right, Down, Up, Left. Now press select to get the sub menu. You press Select + Square to add items and Circle to delete items
PS1 | Submitted by ChrisAll Guns and infinite ammo
Go to the first level pause the game and push x,circle,triangle,L2,R2. you will hear a a dong and exit the level then go back to it and you will have all guns and infinite ammo.
PS1 | Submitted by ChrisDolphin Mode (swim faster and jump out of water)
During play press Square, Square, Triangle, Triangle, Cross, Cross, Circle, Circle
PS1 | Submitted by ChrisVulture Mode (fly)
During play press Circle, R1, R2, Square, Right, L1, L2, Left
PS1 | Submitted by pooHidden Dolls
Dolls are hiddden throughout the game. You collect 10 to get Dolphin Mode and 14 to get Vulture Mode
PS1 | Submitted by pooGrenade-propelled jump
Obtain the Horus Feather. Jump and float just above the ground. Look down and throw a grenade. The explosion will push you upwards. This trick may best be put to use on the second to last level (Kilmaat Colony) to skip to the ending. Go to the room relatively early in the level that contains a bridge with lasers on either side. Look up and to the left to find the exit camel. Hover over to the ground right below the camel and use a grenade to propel your character upwards. Hover and move forwards at the height of the jump to reach the camel.