It is a "fun" challenge and near to impossible to unlock; getting to space! The game has many bugs and has a very big bug that is the reason for EA; WOBBLING ROCKETS the most annoying thing ever it stops me from getting to orbit and going up. Wait for this bug to be fixed and then play the game I liked the experience but it is hard plus if you really want a good experience play the tutorial of ksp2 just play ksp1 until wobbling rockets are gone. I have played this many times over and over again but it's not a great experience if wobbling rockets are still here in 0.2.0.0 then it's ok to play the game.