The following cheat is easier if you have Lara walking (Shift). To end the level, take one step forward, one step backwards, turn around 3 times and then do a forward jump. To get all the weapons do the same, except jump backwards instead of forwards.
To skip a the level, do the following with Lara: Draw a flare by pressing / (forward slash key). Failure to do so will blow up Lara. Take one step forward (hold down the walk key while pressing the up arrow), one step backwards, turn around in full 3 times and then do a forward jump. To get all weapons, do the same, but jump backwards instead of forwards.
