MORE THAN A BARREL OF CAR PHYSICS FUN
BeamNG.drive is a game that has you the player create delete and modify cars and countless other objects. Spawn a car and drive around for a bit.
Make a new one with a better paint job
Shoot a cannon at the car running it through. It's a fantastic sandbox with many maps and even more options. As long as you're not hoping to walk around BeamNG.drive offers so much to do.
It shouldn't bug you
BeamNG.drive simulates every part of the vehicles you drive from each tire to the radiator to engines. This means that collisions do realistic forms of damage to these vehicles and they interact with the 'bodies' of other objects (such as crash test dummies) in interesting ways. Because of all these details, BeamNG is not a completely stable game. Rather than crash constantly the game is sometimes forced to detect an instability and reset all extant objects to their starting positions. But the glitches are amusing and the reset is fast: one could argue it's reason to play the game.