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

Warhammer 40,000: Boltgun
Shared: Retro · FPS · Old School

DOOM + DOOM II
Shared: FPS · Retro · Action

Quake
Shared: FPS · Shooter · Action

CULTIC
Shared: FPS · Old School · Shooter

DUSK
Shared: Retro · FPS · Shooter

Wolfenstein 3D
Shared: Retro · FPS · Old School

Project Warlock
Shared: Retro · FPS · Old School

Half-Life
Shared: FPS · Shooter · 1990's

Counter-Strike
Shared: FPS · Action · Shooter

DOOM 64
Shared: FPS · Action · Retro

Slayers X: Terminal Aftermath: Vengance of the Slayer
Shared: Retro · FPS · Shooter

Call of Duty®
Shared: FPS · Shooter · Action

Battlefield™ 2042
Shared: FPS · Shooter · Action

Ion Fury
Shared: FPS · Retro · Old School

HROT
Shared: Retro · FPS · Shooter

Selaco
Shared: FPS · Shooter · Retro

DOOM
Shared: FPS · Shooter · Action

Titanfall® 2
Shared: FPS · Shooter · Action

BioShock Infinite
Shared: Shooter · Action · FPS

SharpShooter3D
Shared: FPS · Shooter · Action

Turbo Overkill
Shared: FPS · Shooter · Action

Project Warlock II
Shared: Retro · Old School · Shooter

Quake II
Shared: FPS · Action · Shooter

Pixel Gun 3D: PC Edition
Shared: Shooter · FPS · Pixel Graphics