Level select:
Press Circle, X, Triangle, Square, Right, Down, Up, Left on controller two at the world map screen.

Items:
Press Select at the world map screen to display the menu. Press Square + Select to add an item or Circle to delete an item.

Enhanced swimming:
Press Square(2), Triangle(2), X(2), Circle(2) during game play. A dolphin icon will appear to confirm correct code entry. Your character can remain underwater longer and swim faster.

Enhanced flying:
Press Circle, R1, R2, Square, Right, L1, L2, Left during game play. A vulture icon will appear to confirm correct code entry. Press X to fly higher and further.

Grenade-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.

Team dolls:
There are a total of 23 team dolls hidden throughout the game. Each doll represents a member of the development team. Find 10 dolls to activate dolphin mode. This allows your character to swim faster and jump out of the water. Find 14 dolls to activate vulture mode. This allows your character to fly.