From The TimeSplitters Wiki

Tilesets are Mapmaker tools used for adding the feel of the map. Each game has a few tilesets. Changing the Tileset can greatly affect the feel of the level, for example, in TimeSplitters 2 an Industrial Tile map would look like an old, abandonned factory, while changing it to the Alien Tile would give a clean, space look. Additionally, each tile set has 1 or 2 rooms that completely change their looks depending on the set. The tilesets are Timesplitters Alien:A stone shaped area with holograms and ramps. Spaceport:Futuristic Airport with seats and spaceships,very similar to the spaceways map. Industrial:Weapon base with air vents and a missile silo very similar to the level CyberDen. Gothic:A medieval style church with gratings and the large room features Stain glass windows which can be smashed. Virtual:A silver style map with no objects in. Timesplitters2 Alien:A clean,bright tileset with laser doors. The only Colours are white and orange. Victorian:A Victorian style tileset this is probably the most popular Tileset in TS2 as it can be used to meet most themes such as Housing,factory's and haunted mansions.

The original author of Tileset does not have any further information on this article. The author may return to finish the article when information has been gathered, however they welcome anyone to expand on this article.