User Summary Earth's surface is unlivable. The robots created to assist in living underground have enslaved their human creators. A small remnant of humans make the resistance attempting to free mankind from captivity. They have discovered a new plant than can restore breathable air to the planet's surface--if only they can make it there. Fallback features procedural-generated levels, fast paced & unforgiving combat, hundreds of skill combinations. Explore the underground tunnels in a 2.5D environment that allows you to change directions and find hidden areas. Free prisoners, destroy robot patrols, and make your way to the surface.