We have 283 tutorials

If you are new to this whole editing business then check out our Getting Started page which will provide links to the most basic and useful tutorials and guides.

Got an error?

Interlopers error page

Tutorial Categories

General Half-Life 2
Texture Creation
Counter-Strike: Source
Day of Defeat: Source
Team Fortress 2
Left 4 Dead
Video Tutorials


If you want to top up your level design knowledge then give our editing tips a read.

Editing Tips Page

Other Resources

Optimization Guide
A superb guide on all aspects of optimization available in Source.
Official Valve Documentation
This is the wiki setup by Valve for everything related to Source,
a must read.
Extensive Entity Listing
This page comes courtesy of HL2world.com and has every entity and it's uses.
Valve-ERC Collective
Another valuable resource and helpful articles.