The final chamber in the Palace Midas level in Tomb Raider I gives you a clue how to finish it - something like III x [picture of a golden ingot]. But you are in an ancient Greek temple, there is no way they would have used Roman numerals and the sign for multiplying didn't exist.
The fight against the skateboard kid in Tomb Raider I takes place in what looks like an underground skateboard park with random pools of lava in all but one of the pits. While it's understandable that the area needed to fit with the boss' gimmick, having an underground cavern shape itself with ramps was stretching it. Toby Gard in the Anniversary commentary mentioned how the area looked extremely silly.
The Damned in Tomb Raider III; they say they are immortal and have tried suicide to no avail, along with the fact you have to find embalming fluid to stop them rotting, which is Nightmare Fuel in itself. There's also Lara shooting them in the previous level, when using bullets it can be assumed they just got up later or something, but she can also blow them up with explosives, which comes with the idea that they are still fully conscious while blown to pieces.
Lara being a Nominal Hero with a violence spree a mile wide in Tomb Raider Chronicles makes sense when you realize that the entire game is a series of narrations by others about her life, which not only justifies the Continuity Snarl awkwardness of certain portions but also can be Unreliable Narrator territory. Then you realize that this is at Lara's memorial service where she's believed to be dead, and the guests that knew her genuinely consider her to be a gun-blasting maniac with a potential mass murder spree that had overly insane adventures justifying it all.
In the first game, how can snow be so deep in the caves at the beginning of the first game? If the bats are any indication, the cave levels are filled with guano.
