From The TimeSplitters Wiki

Categorising articles makes organising & navigating articles much easier. When you've finished typing your articvle, include it's category(s). To add a category to your article, use the following template, in this example the map is a large map and is completely outdoors.

[[Category:Maps - Medium]]
[[Category:Maps - Completely Outdoors]]

To find out the categorys you can use, see the section that applies. Like, if you want to know what categories you can use for weapons, go to the weapons page.

Category Name Format

Take a look at the Category Page. That list would not be in alphabetical order if the catergorys were not named in a specific format. Instead of let's say, "Short Characters", it's "Characters - Short". This makes it much easier to find the catagory you are looking for.