#4 Kerbal Space Program
Kerbal Space Program invites players to build and pilot a space shuttle by first constructing one out of pre-fabricated modules. Players can choose from a variety of parts including engines, fuel tanks, solid fuel rockets, landing gear, wings, steering fins, and a variety of other parts.
Through experimentation, patience, and ingenuity, players can construct jet planes, space shuttles, landing craft, and even interstellar spacecraft which you can use to orbit the sun.
The game may look like stupid fun, but it’s secretly rather clever fun. If you have a mind to construct a working spacecraft—one powerful enough to reach escape velocity without tearing itself apart and crashing into the ocean—then this game is definitely for you.