Kerbal Space Program 1.0 (Linux)

If you want to support the developers of this amazing game, you can also buy it DRM-free and get all future upgrades at the KSP store.

The hype was not just real but unreal. The forums buckled under the strain of a hype train accelerating from 0 to lightspeed, and we could all tell from the Twitch stream how far the game had come. After 4 long years, at long last we have version 1.0 of KEEERBAALLLL SPACE PROGRAM!!1! (Say it in a jacksepticeye voice or you just won't understand the hype.)

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KERBAL SPACE PROGRAM IS A MULTI-GENRE GAME WHERE THE PLAYERS CREATE THEIR OWN SPACE PROGRAM.
In KSP, you must build a space-worthy craft, capable of flying its crew out into space, without killing them. At your disposal is a collection of parts, which must be assembled to create a functional ship. Each part has its own function and will affect the way a ship flies (or doesn't). So strap yourself in, and get ready to try some Rocket Science!

The game has different game modes, you can play the Career Mode if you want to expand and manage your own Space Center, taking on missions and researching new technologies. Or you can play Sandbox mode if you're only interested in flying and discovering the Kerbal universe without restrictions. There is even a mid point between these two, Science mode.