I was there in ... 2011? or 2013? I can't remember which year I visited the arcade museum, but it was fun. They were, while I was there, working on it, as in, some guys in the back were welding some... staircase or wall fixture or something - while I was walking around playing games.
I couldn't read much Russian, and couldn't speak it, but my brother could, and he had a chat with one of the owners of the museum. They were apparently fixing or rebuilding many of the games from whatever parts they could find - apparently it was quite a challenge to find original parts for some of the games.
I remember playing "sniper" and "sniper 2" and "gorodki" - gorodki was pretty fun, and probably would have been a hit in the US with a different name. :)