#12
Dead Frontier 2 is a hub-based zombie looter where you creep through procedurally placed dark buildings, rationing ammo and hoping the next room has something worth the risk. The atmosphere is one of the better ones on this list—genuinely tense, with a survival-horror feel that most F2P games skip entirely. Core systems are free, monetization stays cosmetic. Development has slowed significantly, though, and the playerbase has shrunk with it. Not the freshest option here, but for solo players who want eerie, methodical zombie survival rather than high-action chaos, it's worth the download.