Games like HeXen II
Games like HeXen II include Half-Life, DOOM + DOOM II, Quake, Counter-Strike, and Half-Life 2. We matched them by the tags players give HeXen II on Steam (Action, FPS, Classic, Fantasy, and Gothic): closest matches first, and among equally close ones the better-known games.

Half-Life
Shared: FPS · Classic · Action

DOOM + DOOM II
Shared: FPS · Classic · Action

Quake
Shared: FPS · Action · Classic

Counter-Strike
Shared: Action · FPS · Classic

Half-Life 2
Shared: Action · FPS · Classic

BioShock Infinite
Shared: Action · FPS · First-Person

Counter-Strike 2
Shared: FPS · Action · Shooter

DOOM 64
Shared: Action · FPS · Classic

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

Quake II
Shared: FPS · Action · Classic

Black Mesa
Shared: FPS · Action · First-Person

DOOM
Shared: FPS · Action · First-Person

Duke Nukem 3D: 20th Anniversary World Tour
Shared: FPS · Classic · Action

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

Call of Duty®
Shared: FPS · Action · First-Person

Half-Life: Blue Shift
Shared: Action · FPS · Classic

Halo: The Master Chief Collection
Shared: FPS · Classic · Action

DUSK
Shared: FPS · Boomer Shooter · Retro

Counter-Strike: Condition Zero
Shared: Action · FPS · Classic

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

STAR WARS™ Battlefront II (Classic, 2005)
Shared: Action · Classic · FPS

DOOM: The Dark Ages
Shared: Action · FPS · Dark Fantasy

Battlefield™ 2042
Shared: FPS · Action · First-Person

Turok
Shared: Action · FPS · Classic