Games like Ultimate Zombie Defense 2
Games like Ultimate Zombie Defense 2 include Left 4 Dead 2, Resident Evil Requiem, Dying Light, Killing Floor 2, and DayZ. We matched them by the tags players give Ultimate Zombie Defense 2 on Steam (Zombies, Action, Survival Horror, FPS, and Online Co-Op): closest matches first, and among equally close ones the better-known games.

Left 4 Dead 2
Shared: Zombies · FPS · Action

Resident Evil Requiem
Shared: Zombies · Survival Horror · Action

Dying Light
Shared: Zombies · Survival Horror · Online Co-Op

Killing Floor 2
Shared: Zombies · FPS · Online Co-Op

DayZ
Shared: Zombies · Online Co-Op · Post-apocalyptic

Left 4 Dead
Shared: Zombies · Action · FPS

World War Z
Shared: Zombies · Online Co-Op · Action

No More Room in Hell 2
Shared: Zombies · Survival Horror · Online Co-Op

Insurgency
Shared: FPS · Action · Realistic

Back 4 Blood
Shared: Zombies · Online Co-Op · FPS

Squad
Shared: FPS · Action · Realistic

7 Days to Die
Shared: Zombies · Online Co-Op · Post-apocalyptic

PUBG: BATTLEGROUNDS
Shared: FPS · Action · Online Co-Op

PAYDAY 2
Shared: Action · FPS · Online Co-Op

Resident Evil Village
Shared: Survival Horror · Action · Zombies

John Carpenter's Toxic Commando
Shared: Zombies · Online Co-Op · FPS

Killing Floor
Shared: Zombies · FPS · Action

Ready or Not
Shared: FPS · Realistic · Action

GTFO
Shared: Online Co-Op · FPS · Survival Horror

Insurgency: Sandstorm
Shared: FPS · Action · Realistic

Call of Duty®: Black Ops III
Shared: Zombies · FPS · Action

Nightmare of Decay
Shared: Action · Survival Horror · Zombies

Arma 3
Shared: Action · FPS · First-Person

Starship Troopers: Extermination
Shared: Action · Online Co-Op · FPS