Thread:Vorknkx/@comment-1915529-20120523190003/@comment-1496755-20120608115301

The Citadel is that high tower where you fight Yun :)

I remember Tomb Raider 2 had a secrets system, in which you get the reward only after you've found all the secrets in the level (usually a bunch of ammo or a weapon). And in its expansion, finding all secrets in all levels unlocked a secret bonus level.

I really liked that - it really motivated me to explore carefully everywhere :)