From The TimeSplitters Wiki

Castle
Size	Medium
Location	Old Castle
Climate	Night
Unlockable	"Village" on Normal
Recommended Bots	N/A
Recommended Weapons	N/A

It's easy to get lost in the Castle. There are loads of twisting corridors, dead ends and very few open areas.

The map is built around a central tower. Each side of the castle has an outdoor room and a staircase. The castle also has a dungeon, a torture room and a roof.