Games like RiotZ
Games like RiotZ include SCUM, Deadlight, Last Oasis, Madness Cubed, and Notes of Soul. We matched them by the tags players give RiotZ on Steam (Indie, Action, Massively Multiplayer, and Zombies): closest matches first, and among equally close ones the better-known games.

SCUM
Shared: Massively Multiplayer · Zombies · Action

Deadlight
Shared: Action · Indie · Zombies

Last Oasis
Shared: Massively Multiplayer · Action · Indie

Madness Cubed
Shared: Action · Indie · Massively Multiplayer

Notes of Soul
Shared: Massively Multiplayer · Action · Indie

DayZ
Shared: Zombies · Massively Multiplayer · Action

Left 4 Dead 2
Shared: Zombies · Action

Skul: The Hero Slayer
Shared: Indie · Action

Nation Red
Shared: Action · Indie · Zombies

Resident Evil 3
Shared: Action · Zombies

Daymare: 1998
Shared: Action · Zombies · Indie

Zombie Night Terror
Shared: Indie · Zombies · Action

Dead Bits
Shared: Indie · Action · Zombies

Tower Unite
Shared: Massively Multiplayer · Indie · Action

Hotline Miami
Shared: Action · Indie

Dead Pixels
Shared: Action · Indie · Zombies

No More Room in Hell 2
Shared: Zombies · Action · Indie

Splatter - Zombiecalypse Now
Shared: Action · Indie · Zombies

Hades
Shared: Indie · Action

CastleMiner Z
Shared: Zombies · Action · Indie

Zombotron
Shared: Action · Indie · Zombies

Blockstorm
Shared: Action · Indie · Zombies

Miscreated
Shared: Zombies · Massively Multiplayer · Action

Earn to Die 2
Shared: Action · Zombies · Indie