Games like Happy Z-Day
Games like Happy Z-Day include PUBG: BATTLEGROUNDS, Resident Evil 4, Orcs Must Die! 3, The Killing Antidote, and Resident Evil 4 (2005). We matched them by the tags players give Happy Z-Day on Steam (Third-Person Shooter, Tower Defense, Zombies, Shooter, and Strategy): closest matches first, and among equally close ones the better-known games.
PUBG: BATTLEGROUNDS
Shared: Shooter · Third-Person Shooter · Strategy
Resident Evil 4
Shared: Third-Person Shooter · Zombies · Horror
Orcs Must Die! 3
Shared: Tower Defense · Third-Person Shooter · Strategy
The Killing Antidote
Shared: Third-Person Shooter · Zombies · Shooter
Resident Evil 4 (2005)
Shared: Zombies · Third-Person Shooter · Horror
They Are Billions
Shared: Zombies · Strategy · Tower Defense
The Last of Us™ Part I
Shared: Zombies · Third-Person Shooter · Shooter
Resident Evil 6
Shared: Zombies · Third-Person Shooter · Action
Plants vs. Zombies: Battle for Neighborville™
Shared: Third-Person Shooter · Zombies · Shooter
Orcs Must Die! 2
Shared: Tower Defense · Strategy · Third-Person Shooter
Thronefall
Shared: Tower Defense · Strategy · 3D
Orcs Must Die!
Shared: Tower Defense · Strategy · Third Person
Dead Space™ 2
Shared: Third-Person Shooter · Shooter · Horror
Resident Evil Requiem
Shared: Zombies · Third-Person Shooter · Horror
Left 4 Dead 2
Shared: Zombies · Shooter · Horror
Resident Evil 5
Shared: Zombies · Third-Person Shooter · Action
Plants vs. Zombies GOTY Edition
Shared: Tower Defense · Zombies · Strategy
The Callisto Protocol™
Shared: Third-Person Shooter · Shooter · Horror
World of Warships
Shared: Third-Person Shooter · Shooter · 3D
The Riftbreaker
Shared: Tower Defense · Hack and Slash · Base Building
Zombie Army Trilogy
Shared: Zombies · Third-Person Shooter · Shooter
Resident Evil 3
Shared: Zombies · Horror · Third-Person Shooter
Marvel Rivals
Shared: Third-Person Shooter · Shooter · 3D
7 Days to Die
Shared: Zombies · Base Building · Survival