TWHL
The Whole Half Life aka TWHL is one of the older fansites for Half-Life that still exists. It's focused almost entirely on the GoldSrc engine and does not contain much Source Engine era content.
However they are known to host mapping competitions and have made one for the Source Engine called TWHL Tower: Source.
TWHL Tower: Source
TWHL Tower: Source is a Source Mod created by members of the TWHL community forums. The competition was created by forum member Dr. Orange.[1]
Creators were given a template with 1280x1280x256 (hammer units) of available mapping space for their portion of a Tower the player must climb.
Contest entry ran from to June 29th, 2021 to January 16th, 2022. The mod was released after many test builds on July 19th, 2024.[2] An Update 1.1.0 patch was released on Jan 31, 2025.