Games like Ultimate Zombie Defense
Games like Ultimate Zombie Defense include Left 4 Dead 2, Back 4 Blood, PUBG: BATTLEGROUNDS, Dead by Daylight, and Killing Floor. We matched them by the tags players give Ultimate Zombie Defense on Steam (Action, Casual, Zombies, Online Co-Op, and Tower Defense): closest matches first, and among equally close ones the better-known games.

Left 4 Dead 2
Shared: Zombies · Co-op · Action

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

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

Dead by Daylight
Shared: Online Co-Op · Co-op · Gore

Killing Floor
Shared: Zombies · Action · Co-op

Bloons TD 6
Shared: Tower Defense · Online Co-Op · Casual

Dying Light
Shared: Zombies · Online Co-Op · Action

Left 4 Dead
Shared: Zombies · Action · Co-op

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

DayZ
Shared: Zombies · Online Co-Op · Survival

Resident Evil 5
Shared: Action · Zombies · Co-op

Resident Evil 6
Shared: Action · Zombies · Co-op

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

HELLDIVERS™ 2
Shared: Online Co-Op · Action · Co-op

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

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

Bloons TD 5
Shared: Action · Tower Defense · Casual

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

Resident Evil Revelations 2
Shared: Zombies · Action · Co-op

Yet Another Zombie Defense HD
Shared: Zombies · Tower Defense · Top-Down Shooter

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

Call of Duty: World at War
Shared: Zombies · Action · Co-op

Blood and Bacon
Shared: Action · Gore · Online Co-Op

Orcs Must Die! 2
Shared: Action · Tower Defense · Co-op