Tomb Raider 2: The Dagger Of Xian

Level skip:
Have Lara perform the following actions during game play. Sidestep left, sidestep right, sidestep left, walk step back, and walk step forward. Release Walk, then spin at least three times in a complete circle in any direction. Finally, jump forwards and turn around in mid-air by pressing Up + Square, Circle (assuming the default controller configuration). 

All weapons:
Have Lara perform the following actions during game play. Sidestep left, sidestep right, sidestep left, walk step back, and walk step forward. Release Walk, then spin at least three times in a complete circle in any direction. Finally, jump backwards and turn around in mid-air by pressing Down + Square, Circle (assuming the default controller configuration). 

Unlimited flares:
Press L2(4) during game play. Although the flares will not appear in inventory, they may be used by pressing Triangle, L2 during game play. Note: This code assumes that the buttons have been left in their default configuration. 

Exploding Lara:
Have Lara perform the following actions during game play. Walk one step forward, one step backward, hold walk while spinning three times in a complete circle in any direction, and jump backward. 

Hint: Exiting Venice: 

Press X after pulling the switch (right before the clock starts) to give Lara's boat extra power. This will allow it to travel up the long ramp that leads to some windows. Lara will crash through the windows and land in the canal just before the exit with plenty of time to spare.
Information in this section was contributed by Carolyn Goodall. 

Alternatively, swim under the mines and you will automatically start the next level with the boat. 
Information in this section was contributed by The Rebel. 

Alternatively, pull the switch, then swim under the door and climb back into the boat. The, go to the exit door without beating the clock.