Kerbal Space Program

[Monk]

I remember playing with this way back when the version was .6 or something. It was utterly hilarious to build rockets and have them critically fail on the launch pad. The game strikes a really fun balance between legitimate rocket science (yeah, seriously) rocket design and simple silly fun.

It's amazing to see how far the game's come. The newest version in the video kekvit post actually has orbit paths and a moon. While you could always achieve orbit, it looks significantly "easier" to do so now.

If you've never had the fun of KSP then you really owe it to yourself to check it out.

@The King

Check their forums and ask there. When i last visited there were tons of helpful people who could give you all kinds of advice, and the devs love throwing math and formulas around and showing off how deep the mechanics of their game are. I don't know if it's still there but in the old versions there were tons of mods available for more engines, rocket types and different stage separation devices. That's where the real fun came from imo.