Bugs

Bugs are usually program errors, which keep them from working correctly. There are a lot of those in the Tomb Raider games. Some can be quite useful, others might make the game difficult.

Here is a list of the useful bugs:

Climbbug
Cornerbug
Coverbug
Cratebug
Fencebug

Annoying bugs:

There is also a long list of annoying bugs.

In Tomb Raider III there was a bug which caused invisible walls to appear. There were cases of that in the 3rd London Level Lud's Gate.

In Tomb Raider V, especially in the last level Red Alert you will encounter the savegame bug. You have to be very careful where you save your game, otherwise things might not be working correctly.