Have a look at Factorio. It’s DRM free and you can easily spend hundreds or thousands of hours on it if you like it. Try the free demo first. Also keep in mind that it’s never on sale (or always, depends how you look at it). Be warned though, it’s very addictive.

Let’s not all be downers here. This actually sound like nice improvements, I might give the groups a try.

Thanks

Thanks, it would never occur to me to look for it on Wikipedia.

Is it on a stable website, or does it change sometimes? And what’s the address?