The multiplayer portion of Half-Life was included in the retail version of Counter-Strike as a mod. Half-Life and other GoldSrc-based games used World Opponent Network, an online gaming service, created by Sierra, until it was shut down on July 31, 2004, and replaced with Steam. Some of the weapons have a different behavior in the multiplayer. The players can also select a 'spraypaint image' from a list, or import a custom image, and apply it to any surface in a level. The players are given the ability to customize the appearance of their characters, and can change their character model and its skin color from the options. Half-Life features a deathmatch mode, and a team deathmatch mode, and it supports up to 32 players.
