Battletech Essentials (GDR)

One of the first serious "gamer" games that I and my friends got into back in junior high and one that we still play to this day when given the chance. A good, solid, absorbing game, BT is just filled to the brim with so many cool little details. ANY game where you can blow off a giant robot's arm and then pick it up and beat him over the head with it while at the same time trying to carefully balance how many of your weapons systems you fire off in an attempt to keep your nuclear powered engines from overheating to the point where all of your ammo starts going off like popcorn inside your armor is a GOOD game.