a smaller version of the singelplayer but in multiplayer form! thanks to that this game is free and that it is actualy a copy of the singelplayer you may want to try this one out but it may grow old after a while
Great deathmatch game! In some servers this game gets very challenging due the players's skills, there's even some websites with good tutorials to teach you how to master the game. And if you are tired of playing deathmatch there's a lot of custom maps and modes to play, like roleplay, coop and even puzzles (those are great and annoying at the same time!).
HL2:DM got me started on multiplayer fps online gaming. The core game is semi fun, but it's the crazy user made maps and mods that really pull this game through to be very fun and worth the time.
It features unique gameplay of using the gravity gun. There is nothing like the feeling of plunging someone with a toilet. Half Life 2 has some of the greatest physics. The game is free if you have an ATI or NVIDIA GPU. There isn't so much to it but the players of HL2DM have massive amounts of custom maps and scripts. Even roleplay scripts similar to Garry's Mod.