beamNG.Drive
im not all that much of a car person, dont get me wrong i think cars are awesome! what a cool technology, but still i have never really had an interest or fixation to them. but still beamNG.Drive is one of my MOST PLAYED GAMES!! i got it a couple years ago when i first got my pc because it was on sale and i had noooo idea what to play, messing around with physics and the car crashes together is such a fun thing to do, eventually i got a steering wheel and pedals (maybe ill upload a pic) and it made the game so much better, very often do i find myself coming back to this game and being fixated on it for a week before having a bit of a break, driving for hours and testing out different cars, tuning, upgrades and all that makes for such a fun experience
if you like cars, or just a sandbox game with awesome and realistic physics, beamNG is a great choice!! seriously... i love this game