First off I wanted to clarify some confusion here. I've seen a lot of recent reviews on here talking about Redshell, Spyware, EULA etc. Redshell was added in 2018 and was then quickly removed in a patch a few weeks later due to community backlash. There's nothing to worry about now, here's the patch notes... https://forum.kerbalspaceprogram.com/index.php?/topic/176077-kerbal-space-program-144-and-making-history-13-launching-today/ Anyways this game really does teach you how spaceflight works, far more than any text book or Youtube video can. You think you understand how it works, then you play this game and something in your brain just clicks. It's all good learning from diagrams, animations and numbers but there's something about doing it in this game that makes it so intuitive. When you finally manage to land on the Mun, it feels like a grand achievement because of all the failures you make along the way. Once you get good at it you begin to understand aspects of orbital mechanics, DeltaV requirements, rendezvous, gravity assists, resonant frequency orbits. All of that sound scary at first but the brilliance of this game is that you naturally learn it as you go, it's awesome!
