Kerbal Space Program

The game has attracted a passionate, talented, dedicated community of players and creators. ...My main fear of simulation titles is that I'll get bored. But, come to think of it, not once was I bored with Kerbal Space Program. I may have felt confused, and irritated, and hopeless at times, but those setbacks were fleeting. My desire to improve remains steadfast. Even the smallest accomplishments feel like massive victories, and once you experience that euphoria, you won't want to quit. Watch your ambition soar.

Kerbal Space Program provides something for everyone: players who will never see a return voyage from “the Mun,” and those who delve into special resource gathering, landing, docking, and crew-out-of-ship activities. ...If you’re just looking to create unbelievable, ridiculous rockets with an impractical number of fuel pods, you can still have plenty of fun. Whatever your level of engagement, you can enjoy shooting these little green Smurfs into space – or into the nearby scenery.

Kerbal Space Program does the improbable: it makes learning a complex subject fun. Its cute, clueless characters and sense of humor turn a hardcore physics simulator into something replayable and addictive. Designing, flying, and then retrying missions again and again is a tough challenge that goes right up to the brink of frustration, but the eventual success of achieving virtual space flight is rewarding and even inspirational.