In TimeSplitters 2, there are a few Arcade League missions that take place in the beginning of the Story level Siberia, this level cannot be unlocked and is only used four times throughout the whole game. It's seen in in Pane In The Neck, Bricking It, Shrinking From The Cold, and Golden Thighs. There are weapons all around the map, and the door to the Dam is locked. There is, however, a cheat in Action Replay Max which allows you to explore the level.