I had about six hours time in Moscow before entering my next train. A bit too much time for getting from one train station to another, eating and sitting around. So I looked for something to do while being in Moscow. I already visited the basic sights like the Red Square last time I was in Moscow, so I was looking for something more unusual.
I checked the Wikivoyage page of Moscow and one of the first things it mentions is the Museum of Soviet Arcade Machines. That sounded like it's worth a visit. I checked the location and it is quite centrally located, only a few minutes walk from the Metro station Baumanskaya. (If you exit the metro, you're already on Baumanskaya street and the Museum is in Baumanskaya street 11.)
As the name says, the museum features arcade machines from the soviet aera. You get a couple of real soviet 15 Kopek coins when entering that you can spend on playing. So I played some rounds of Magistral (Магистраль) - seems something like the soviet answer to Pacman - and others. Honestly, for many of the games I failed to understand how they were supposed to be played. What was interesting that there were a couple of "games" that featured non-virtual content. For example, there was a game where you could control a little toy tank called Tankodrom (танкодром), but I didn't really understand how to play that game either. Obviously there were quite a number of games with cold war references. The Museum also includes some tables where you can have a coffee after playing. If you ever happen to be in Saint-Petersburg, the museum has a branch there, too.
After that I went to Kazansky railway station where my next train was leaving. Moscow has several train stations and some of them are named after the countries where their international trains are heading. So for me that meant I entered Moscow at the Belorussky railway station (because I came through Belarus) and I left at Kazansky railway station (because I was heading to Kazakhstan). (someone in the comments told me this is wrong and Kazaksny station refers to the city Kazan - so I was probably wrong on this naming)