Games like Sinned Arena
Games like Sinned Arena include Warhammer 40,000: Boltgun, CULTIC, ULTRAKILL, DUSK, and DOOM + DOOM II. We matched them by the tags players give Sinned Arena on Steam (Action, Boomer Shooter, Arena Shooter, Shooter, and FPS): closest matches first, and among equally close ones the better-known games.

Warhammer 40,000: Boltgun
Shared: Boomer Shooter · FPS · Action

CULTIC
Shared: Boomer Shooter · Action · Shooter

ULTRAKILL
Shared: Boomer Shooter · FPS · Arena Shooter

DUSK
Shared: Boomer Shooter · FPS · Shooter

DOOM + DOOM II
Shared: Action · FPS · Boomer Shooter

HROT
Shared: Boomer Shooter · FPS · Shooter

Quake
Shared: Action · FPS · Shooter

SharpShooter3D
Shared: Boomer Shooter · Action · FPS

Counter-Strike 2
Shared: Shooter · Action · FPS

Turbo Overkill
Shared: Boomer Shooter · Action · FPS

Quake II
Shared: Action · Boomer Shooter · FPS

DOOM Eternal
Shared: Action · FPS · Shooter

AMID EVIL
Shared: Boomer Shooter · Arena Shooter · FPS

DOOM 64
Shared: Action · FPS · Boomer Shooter

DOOM
Shared: Action · FPS · Shooter

Prodeus
Shared: Boomer Shooter · Action · FPS

BRAZILIAN DRUG DEALER 3: I OPENED A PORTAL TO HELL IN THE FAVELA TRYING TO REVIVE MIT AIA I NEED TO CLOSE IT
Shared: Boomer Shooter · Arena Shooter · FPS

Half-Life
Shared: FPS · Action · Shooter

WRATH: Aeon of Ruin
Shared: Action · Boomer Shooter · FPS

Call of Duty®
Shared: Action · FPS · Shooter

BioShock Infinite
Shared: Action · Shooter · FPS

Counter-Strike
Shared: Action · FPS · Shooter

Hellbound
Shared: Action · FPS · Shooter

Forgive Me Father
Shared: Boomer Shooter · Action · FPS