Here’s something that people here may find interesting. It’s an indie game called Kerbal Space Program. Basically you design a rocket (by dragging components together in a vertical assembly building), put it on the pad, launch it and try to get your astronauts back to Kearth safely. You can find it here.
It’s still in beta so there are a few bugs and they are still adding features. OTOH, it’s free.
Here’s a sample mission I ran:
On the pad.
Launch!
Boosters jettisoned
The Kearth is round! (Maximum altitude - 513.9 km)
Preparing for re-entry; orbital sunrise
Touchdown!