For me personally, at their time, those would be Battlezone 1, GTA 1 and Quake 1. Battlezone is a first person action/strategy game that takes place on other planets such as the moon and Mars. Build bases, deploy forces, manage resources and build your empire,all from the pilot's seat of your tank. You can pilot one of 20 anti-gravity war machines equipped with weapons of destruction: mortars, mines and the devastating Thumper Device, which launches a Richter-heavy groundquake over the morphable terrain. The game features full D3D support and a quick software rendering engine which incorporates actual images from NASA space expeditions.