It’s not often these days that you see a videogame and, independently of how it looks, think: “man, it’d be a lot of fun to have a play with that…” Yet that’s what this video will make you think. If you’ve ever wished you could make a magic door that’d connect your bedroom to your girlfriend’s house, or to your workplace, or to the top of mount Everest, well, maybe this game from Valve’ll bring that dream a little closer…