Tomb Raider (1996)
Note: This is the 1996 game by Core Design Ltd., not to be confused with the 2013 game Tomb Raider by Crystal Dynamics .
Level skip
Have Lara walk one step forward (with [Shift]), one step back (with [Shift]), rotate in three full circles to the right (with [Shift]), and jump forward (with [Alt]).
All weapons
Have Lara walk one step forward (with [Shift]), one step back (with [Shift]), rotate in three full circles to the right (with [Shift]), and jump back (with [Alt]).
All weapons and infinite ammunition
Beat the game and load any saved level to have access to all weapons, infinite ammunition, and additional enemies.
The image featured at the top of this post is ©Square Enix.