Games like Serious Sam: Siberian Mayhem
Games like Serious Sam: Siberian Mayhem include BioShock Infinite, Half-Life 2, Black Mesa, CULTIC, and METRO Last Light Redux. We matched them by the tags players give Serious Sam: Siberian Mayhem on Steam (Boomer Shooter, Action, Adventure, Shooter, and First-Person): closest matches first, and among equally close ones the better-known games.

BioShock Infinite
Shared: Action · Shooter · First-Person

Half-Life 2
Shared: Action · Shooter · Adventure

Black Mesa
Shared: Action · First-Person · Shooter

CULTIC
Shared: Boomer Shooter · Shooter · Action

METRO Last Light Redux
Shared: Action · Atmospheric · First-Person

Grand Theft Auto V Legacy
Shared: Action · First-Person · Shooter

DOOM
Shared: Action · Shooter · First-Person

Left 4 Dead 2
Shared: Shooter · Action · First-Person

BioShock™ Remastered
Shared: Atmospheric · Action · First-Person

BioShock™
Shared: Action · Atmospheric · First-Person

Space Hulk: Deathwing - Enhanced Edition
Shared: Action · Shooter · Adventure

Far Cry 3
Shared: Action · Adventure · Shooter

METRO 2033 Redux
Shared: Action · Atmospheric · First-Person

Far Cry® 4
Shared: Action · Adventure · Shooter

PUBG: BATTLEGROUNDS
Shared: Shooter · Action · Adventure

Call of Duty®: Black Ops III
Shared: Action · Shooter · First-Person

Half-Life: Alyx
Shared: Shooter · Action · First-Person

Fallout 4
Shared: Adventure · Shooter · Atmospheric

BioShock™ 2 Remastered
Shared: Action · Atmospheric · First-Person

Ready or Not
Shared: Shooter · First-Person · Action

Metro Exodus
Shared: Action · Atmospheric · First-Person

BioShock® 2
Shared: Action · Atmospheric · First-Person

DOOM Eternal
Shared: Action · Shooter · First-Person

PEAK
Shared: Adventure · First-Person · Online Co-Op