Kerbal Space Program (KSP) is a game/physics simulator. You basically have a "Lego" assortment of aerospace parts and can build mostly anything you can imagine and then test it out in a solar system-sized sandbox.
So, I recently returned to KSP after years of absence. Last week, I saw part of a documentary on the old Soviet Buran, their analogue of NASA's STS shuttles. I tried to make the orbiter as close as possible to real world spec, but I found I could vastly improve on the boosters and LF core, so I did.
All just a bit of fun really, but she does perform very well indeed.