Games like Halo 3: ODST
Games like Halo 3: ODST include Halo: The Master Chief Collection, Half-Life 2, Black Mesa, Red Dead Redemption 2, and Call of Duty®: Black Ops III. We matched them by the tags players give Halo 3: ODST on Steam (Action, Atmospheric, Story Rich, Sci-fi, and First-Person): closest matches first, and among equally close ones the better-known games.

Halo: The Master Chief Collection
Shared: Great Soundtrack · Story Rich · FPS

Half-Life 2
Shared: Action · Sci-fi · FPS

Black Mesa
Shared: Action · Sci-fi · FPS

Red Dead Redemption 2
Shared: Story Rich · Action · Atmospheric

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

Half-Life
Shared: Sci-fi · Action · FPS

Halo Infinite
Shared: Action · FPS · First-Person

DOOM
Shared: Action · Great Soundtrack · FPS

BioShock Infinite
Shared: Action · First-Person · Story Rich

Half-Life: Opposing Force
Shared: Action · Sci-fi · FPS

DOOM Eternal
Shared: Action · Great Soundtrack · FPS

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

BioShock™
Shared: Atmospheric · Action · Story Rich

Half-Life: Alyx
Shared: Story Rich · FPS · Action

Metro Exodus
Shared: Action · Story Rich · Atmospheric

Fallout 4
Shared: Atmospheric · Singleplayer · Action

Cyberpunk 2077
Shared: Story Rich · Sci-fi · Singleplayer

BioShock™ Remastered
Shared: Atmospheric · Story Rich · Action

Call of Duty®: Modern Warfare® 2 (2009)
Shared: Action · FPS · First-Person

Far Cry® 4
Shared: Action · Co-op · FPS

Far Cry 3
Shared: Action · FPS · Co-op

STAR WARS™ Republic Commando™
Shared: Action · Sci-fi · FPS

Half-Life: Blue Shift
Shared: Action · Sci-fi · FPS

Halo: Campaign Evolved
Shared: Action · FPS · Sci-fi