Games like Flight 666
Games like Flight 666 include 60 Seconds!, 60 Seconds! Reatomized, School Days, Deep Rock Galactic, and The Exit 8. We matched them by the tags players give Flight 666 on Steam (Exploration, Outbreak Sim, FPS, Immersive Sim, and Hidden Object): closest matches first, and among equally close ones the better-known games.

60 Seconds!
Shared: Exploration · Outbreak Sim · Immersive Sim

60 Seconds! Reatomized
Shared: Exploration · Outbreak Sim · Immersive Sim

School Days
Shared: Exploration · Immersive Sim · Life Sim

Deep Rock Galactic
Shared: FPS · Exploration · PvE

The Exit 8
Shared: Exploration · Immersive Sim · Walking Simulator

Internet Cafe Simulator 2
Shared: Exploration · Immersive Sim · Simulation

[Chillas Art] The Closing Shift
Shared: Immersive Sim · Exploration · Simulation

Prehistoric Hunt
Shared: Exploration · FPS · Immersive Sim

Gloomwood
Shared: Immersive Sim · FPS · Exploration

Workshop Simulator
Shared: Exploration · Immersive Sim · Hidden Object

Stone Simulator – Just Be a Rock
Shared: Exploration · Immersive Sim · PvE

GoreBox
Shared: FPS · PvE · Immersive Sim

Slime Rancher
Shared: Exploration · Cute · Simulation

Project Silverfish
Shared: Exploration · FPS · Immersive Sim

Car For Sale Simulator
Shared: Immersive Sim · FPS · Life Sim

Platform 8
Shared: Exploration · Hidden Object · Immersive Sim

My Winter Car
Shared: Racing · Life Sim · Immersive Sim

Mon Bazou
Shared: Exploration · Racing · Life Sim

Mirror 2: Project X
Shared: Interactive Fiction · FPS · 3D

Car Dealership Simulator
Shared: FPS · Immersive Sim · Life Sim

Prologue: Go Wayback!
Shared: Exploration · Immersive Sim · PvE

Car Dealership Simulator 2
Shared: FPS · Immersive Sim · Life Sim

Restore Your Island
Shared: Exploration · Immersive Sim · Simulation

TOGETHER BnB
Shared: FPS · Life Sim · 3D