Games like Ninety-NIne (99)
Games like Ninety-NIne (99) include Aimlabs, BONEWORKS, BONELAB, BioShock Infinite, and Arma 3. We matched them by the tags players give Ninety-NIne (99) on Steam (Action, Simulation, Adventure, Shooter, and FPS): closest matches first, and among equally close ones the better-known games.

Aimlabs
Shared: Simulation · Action · FPS

BONEWORKS
Shared: Action · VR · Shooter

BONELAB
Shared: VR · Action · Shooter

BioShock Infinite
Shared: Action · Shooter · FPS

Arma 3
Shared: Action · Simulation · Shooter

Half-Life: Alyx
Shared: VR · FPS · Action

Half-Life 2
Shared: Action · FPS · Shooter

Apex Legends™
Shared: Action · Shooter · FPS

Far Cry® 5
Shared: Action-Adventure · Shooter · FPS

Paladins®
Shared: Action · Shooter · FPS

KovaaK's
Shared: Action · Simulation · Shooter

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

Far Cry® 6
Shared: Action · FPS · Shooter

Far Cry 3
Shared: Action · Adventure · FPS

Hot Dogs, Horseshoes & Hand Grenades
Shared: VR · Shooter · Simulation

Atomic Heart
Shared: Action · Adventure · FPS

Arma Reforger
Shared: Simulation · Action · Shooter

PUBG: BATTLEGROUNDS
Shared: Shooter · Action · FPS

Call of Duty®
Shared: Action · FPS · Shooter

VLADiK BRUTAL
Shared: Action · Shooter · FPS

Arizona Sunshine® VR 2
Shared: Action · VR · Adventure

Ready or Not
Shared: Shooter · FPS · Action

Black Mesa
Shared: Action · FPS · Shooter

Onward
Shared: VR · Shooter · FPS