This is an incredible game, that is great fun for anyone who likes physics, and sandbox games.

Try to get your Kerbals to space, and beyond but it isn't as easy as it sounds. Facing any number of ways to fail from blowing up to getting your poor kerbals stuck in orbit.

The Carreer mode is pretty good. You get to complete missions for funds and science points, as well as gather science points on your own. The funds are used to build rockets and the science points are used to advance the skill tree.

In 1.0 they added a decent aerodynamics system. However, some players may want something even more realistic. For that, there are mods.

1.1 They added improvements to the physics engine. However, this did add some bugs from these upstream updates. These bugs should be resolved in a future release, and the improved performance is certainly worth dealing with a few bugs.

KSP has a highly active and vibrant community of fans and mods widely available. This makes it a very fun game to follow the development of. My favorite mods are SCANSat (a mapping satalite system), FAR (Better aerodynamics), RLA-Stockalike (a bunch of stock-styled additional parts) SpaceY (some nice rocket engine parts) Fuel Tanks Plus (adds more tanks and enhanced skins to tanks), SXT (More stockalike parts) and B9 Aerospace (lots of plane parts and some really big space station parts.)