Not a game, but it is
free O0
https://store.steampowered.com/app/224000/Project_Eagle_A_3D_Interactive_Mars_Base/
Quote
Is Project Eagle a game?
No, Project Eagle is an interactive art demo or diorama. It is not a game in the conventional sense. You can use your mouse and keyboard to explore Eagle Base, but are limited in your ability to interact with your environment in the way you would be able to in most conventional games. If you want to make a game of Project Eagle we challenge you to complete the "Life on Mars" Steam achievement by finding all five Martian colonist hidden in Eagle Base. They are to scale so are very small and very difficult to spot which makes this quite the challenging game of hide and seek.
Why are you releasing Project Eagle?
In the year and a half since Project Eagle was presented on stage at the 2017 D.I.C.E. Summit we have been contacted by countless fans and several educational institutions asking if they could see, experience, or use Project Eagle. Now that we have made it available for free on Steam the answers is Yes!
https://steamcommunity.com/app/224000/discussions/0/1743352529782643259/
...drats. Can't get it to run on my old rig :(
I love how it took no time for the flat Earthers to hit the Steam Discussion. :DD
Nice pickup thanks Steve.