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A lot of talks are going on currently with DayZ, with really a shitload of full servers...maybe 150-200 servers currently. Lots of fun with atmoshperic gameplay. You have to eat and drink, find weapons, can build vehicles, joining factions i.e. outlaws/bandits and so on...controlling areas and fighting zombies, character is saved on main project server. All this in a really huge open world. The world has a day & night circle, and its really that dark in the night...you can get torches, flares and stuff no worry + a good portion of adrenalin kick. Probably the best multiplayer expirience you can get currently with a zombie & survival theme.
The crazy thing is, due to this mod Arma 2:CO is the top selling game currently on steam....O_o, dayz itself is free. Almost 50.000 characters are already registered in the game stats with growing numbers, wheras the mod developer thought it would have success with just some hundreds.
The full package Arma 2: CO is around 24$ bucks on their main page arma2.com, same price like on Amazon/Steam. Arma 2. OA is available for 12$ on gamesrocket.com which you could play with the Arma 2 free version, but the free version has less graphic details. Better get the package.
Surviving Guide/introduction into gameplay:
Very intersting Interview on rockpapershotgun:
Since Arma 3 will be released this year, Iam sure with such a big echo from players this mod will have a compatibility patch. Iron Front: Liberation 1944 is another release with the same engine, looks promising aswell for those who love world war 2 themes with a more realistic damage model for the tanking combat...
edit: didnt see the other thread about DayZ..sry