Kerbal Space Program

You lead the space agency of a race of playful green creatures. You'll need to construct rockets, aircraft, and rovers from available parts to explore the neighboring solar system.

Realistic aerodynamics and orbital mechanics forgive no miscalculations. Rockets flip on the launchpad, stages fail to separate, and attempts at a soft landing often result in a brand-new crater. Every explosion becomes a valuable lesson for the next, more refined vessel.