This is one of those oldies that you don't ever get bored of playing . The game was originally called A-Tractor if anyone recalls playing it :o. It's been around for quite a few years now and has come a long way since it's "A-tractor" days.
It's main site says mmorpg but it doesn't have a large amount of users on at once. It's a great game nonetheless, one of those economic type where you basically try to become the richest on the server.
The url is http://theuniversal.net/ if anyone wants to take a look .