Games like Viper
Games like Viper include DOOM Eternal, DOOM, ACE COMBAT 8: WINGS OF THEVE, Project Wingman, and Half-Life 2. We matched them by the tags players give Viper on Steam (Action, Arcade, On-Rails Shooter, Shooter, and Singleplayer): closest matches first, and among equally close ones the better-known games.

DOOM Eternal
Shared: Action · Great Soundtrack · Fast-Paced

DOOM
Shared: Action · Shooter · Great Soundtrack

ACE COMBAT 8: WINGS OF THEVE
Shared: Action · Shooter · Flight

Project Wingman
Shared: Action · Arcade · Singleplayer

Half-Life 2
Shared: Action · Singleplayer · Shooter

Super Hexagon
Shared: Arcade · Great Soundtrack · Fast-Paced

Swarmlake
Shared: Action · Arcade · Shooter

ACE COMBAT™ 7: SKIES UNKNOWN
Shared: Arcade · Shooter · Action

MULLET MADJACK
Shared: Arcade · Action · Fast-Paced

Hotline Miami 2: Wrong Number
Shared: Action · Great Soundtrack · Fast-Paced

Vanquish
Shared: Action · Singleplayer · Shooter

My Friend Pedro
Shared: Action · Shooter · Great Soundtrack

BioShock Infinite
Shared: Action · Shooter · Singleplayer

Grand Theft Auto V Legacy
Shared: Action · Shooter · Singleplayer

PAC-MAN™ Championship Edition DX+
Shared: Arcade · Action · Great Soundtrack

LUFTRAUSERS
Shared: Arcade · Action · Great Soundtrack

Hotline Miami
Shared: Action · Great Soundtrack · Fast-Paced

METAL GEAR RISING: REVENGEANCE
Shared: Action · Great Soundtrack · Singleplayer

Black Mesa
Shared: Action · Singleplayer · Shooter

Call of Duty®
Shared: Action · Shooter · Singleplayer

TEKKEN 7
Shared: Action · Arcade · Singleplayer

ULTRAKILL
Shared: Fast-Paced · Great Soundtrack · Singleplayer

Titanfall® 2
Shared: Shooter · Action · Singleplayer

SONIC X SHADOW GENERATIONS
Shared: Action · Great Soundtrack · Fast-Paced