This game is becoming very popular since its arrival to steam a week ago, has more avg active players than a lot of top f2p titles.

Based off of the S.T.A.L.K.E.R series, and has the same devs.

Has its own custom made engine that works pretty nice.

Currently a pvp game, though soon there will be an open world rpg style mmo fps type mode with quests and what not.

Guys should check it out.