[RS]Descent + Descent 2 (classic space shooters, full ISOs)
Descent is a stomach wrenching game that is a truly 3D action shooter. In Descent you control a robot which must navigate through tunnels collecting weapons, bonuses, collection hostages. While this sounds easy being completely 3D game you must maneuver through tunnels dodge other enemy robots who come at all angles and manage to stay alive.
Back with even more and better stomach wrenching game 3D. In Descent 2 you are warped to the Zeta Aquillae system facing even more advanced robots with a new arsinal of weapons and capabilities.
Link checked on 11 Dec 2010