Car Builder

The Good
This isn't really a game, but it's still fun to design and test your own car. There probably have been car building sims since then, but I'm sure this is the first one.

You can choose chsases, engine, brakes, suspension, fuel tank etc for your car, and then you can also choose the body. My favourite feature is that you can finetune the shape of the body -- you can try to create a really aerodynamic car, but I found it even more fun to construct absolutely absurd shapes and see what the program has to see about that. And you can test your creation in a wind tunnel and on the road.

The Bad
I would have liked to have a little more info on what various elements do. As such, a lot of the program is guesswork -- thankfully, there is a manual out there which explains a bit.

The Bottom Line
Although it is over 40 years old, this is still a unique program that is still fun to play with. Would have been absolutely perfect if you were able to drive your creation :)