Games like Arena
Games like Arena include Half-Life 2, BioShock Infinite, Call of Duty®: Black Ops III, Black Mesa, and Titanfall® 2. We matched them by the tags players give Arena on Steam (Action, Shooter, Arena Shooter, FPS, and 3D): closest matches first, and among equally close ones the better-known games.

Half-Life 2
Shared: Action · FPS · Shooter

BioShock Infinite
Shared: Action · Shooter · FPS

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

Black Mesa
Shared: Action · FPS · Shooter

Titanfall® 2
Shared: FPS · Shooter · Action

Call of Duty®
Shared: Shooter · FPS · Action

DOOM
Shared: Action · FPS · Shooter

Halo Infinite
Shared: FPS · Shooter · Action

Aimlabs
Shared: Shooter · FPS · Action

RoboCop: Rogue City
Shared: Action · FPS · Shooter

Shotgun Farmers
Shared: Action · Shooter · FPS

Apex Legends™
Shared: Shooter · FPS · Action

Half-Life
Shared: FPS · Shooter · Action

Battlefield™ 2042
Shared: Shooter · FPS · Action

KovaaK's
Shared: Action · Shooter · FPS

Paladins®
Shared: Shooter · Action · FPS

DOOM Eternal
Shared: Action · FPS · Shooter

Call of Duty®: Modern Warfare® 2 (2009)
Shared: Action · Shooter · FPS

Counter-Strike: Source
Shared: Shooter · Action · FPS

Half-Life: Opposing Force
Shared: Action · FPS · Shooter

Wolfenstein: The New Order
Shared: Action · FPS · Shooter

Starship Troopers: Extermination
Shared: Action · FPS · First-Person

STAR WARS™ Battlefront™ II
Shared: Shooter · Action · FPS

Call of Duty® 4: Modern Warfare® (2007)
Shared: Action · FPS · Shooter