In TimeSplitters 2, the beginning of the Story level Siberia was originally available as a selectable map in Arcade Custom, but cannot be unlocked in the retail version of the game without the use of hacks. It is still used four times in the game in a few Arcade League matches and Glass-Smashing Challenges which are Pane In The Neck, Bricking It, Shrinking from the Cold, and Golden Thighs.
There are several weapon spawns all around the level. The door to the dam is locked but there is a cheat in Action Replay Max which allows you to explore the level.