Running With Scissors released for free the multiplayer version of
Postal 2: Share the Pain, the multiplayer expansion to their controversial FPS
Postal 2. Go and Share the Pain if you like.
Share The Pain uses the Unreal Graphics Engine and contains 14 multiplayer maps, 25 playable characters, 11 crazy weapons and 4 different gametypes (Deathmatch, Team Deathmatch, "Snatch"/CFT/pick up a woman, "Grab"/collect a series of power-ups) .
The four different multiplayer modes honestly don't do much to extend the game's value, either, largely because not many people are playing them. Still, a built-in server browser theoretically makes it easy to hop into an online session, and if you host a game session, you can throw in some computer-controlled bots (which the game calls "morons") if you want more targets to shoot at. Your main modes here are conventional deathmatch, team deathmatch, and a capture-the-flag variant called "snatch," in which the "flag" is a scantily clad woman who piggyback rides on whomever picks her up. Snatch and team deathmatch seem to be the most popular modes, relatively speaking, whereas the "grab" mode, in which players battle to collect a series of power-ups, doesn't seem to be much of a draw. There are more than a dozen different multiplayer maps, all seemingly based on areas from the single-player game, and while most of the maps are pretty basic, they're reasonably varied, and a few stand out. Also, a few of Postal 2's more-unusual gameplay features, such as the ability to urinate on anything at any time and the ability to commit suicide by detonating a grenade in one's mouth at the touch of a button, can actually come into play during multiplayer, lending the action a decidedly different tone than what you may be used to.
Source: Gamespot
In anticipation of the release of Postal 3 in October 2008, the multiplayer element of Postal 2 has been made available for free.
Originally released in 2004, the Postal series of games gained notoriety for it's high levels of violence and stereotyping and as far as we know, is still banned in Australia, Brazil and New Zealand.
Wiki Entry about Postal 2 STP