During gameplay, do the following:
Level skip: Press / to put a flare in Lara's hand. Have Lara walk
one step forward (with [Shift]), one step back (with [Shift]),
rotate in three full circles in any direction (with [Shift]), and
jump forward (with [Alt]).
All weapons: Press / to put a flare in Lara's hand. 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]).
Exploding Lara: 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]).