Games like Undead World Order
Games like Undead World Order include Left 4 Dead 2, BALL x PIT, Resident Evil 4, Resident Evil Requiem, and Planes, Bullets and Vodka. We matched them by the tags players give Undead World Order on Steam (Action, Zombies, Shoot 'Em Up, Arcade, and Top-Down Shooter): closest matches first, and among equally close ones the better-known games.

Left 4 Dead 2
Shared: Zombies · Action · Shooter

BALL x PIT
Shared: Action · Arcade · Shoot 'Em Up

Resident Evil 4
Shared: Action · Zombies · Survival Horror

Resident Evil Requiem
Shared: Zombies · Action · Survival Horror

Planes, Bullets and Vodka
Shared: Action · Shoot 'Em Up · Arcade

Earn to Die 2
Shared: Action · Zombies · 2D

The Last Stand: Aftermath
Shared: Zombies · Top-Down Shooter · Shooter

Resident Evil 2
Shared: Zombies · Action · Survival Horror

Zombotron
Shared: Action · Zombies · 2D

Bit Blaster XL
Shared: Shoot 'Em Up · Arcade · Action

Guns, Gore & Cannoli
Shared: Action · Zombies · Shoot 'Em Up

Cyberhunt
Shared: Action · Shoot 'Em Up · Arcade

Zombie Shooter
Shared: Zombies · Action · Shoot 'Em Up

Resident Evil 4 (2005)
Shared: Action · Zombies · Survival Horror

Sky Force Reloaded
Shared: Shoot 'Em Up · Arcade · Action

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

Zombieville USA 3D
Shared: Action · Arcade · Top-Down Shooter

Call of Duty®: Black Ops
Shared: Action · Zombies · Shooter

DayZ
Shared: Zombies · Shooter · Post-apocalyptic

SNKRX
Shared: Shoot 'Em Up · Top-Down Shooter · Arcade

World War Z
Shared: Zombies · Action · Shooter

LUFTRAUSERS
Shared: Action · Arcade · Shoot 'Em Up

The Last of Us™ Part I
Shared: Zombies · Shooter · Post-apocalyptic

Commando Collection
Shared: Action · Shooter · Arcade