Took me a while to figure out how to use that plug thing used to push the marble into the container. Fucking engrish.
The noise of the ball in the bottle gets annoying after a while, though. On the plus side, since it's a pretty thick glass container, it goes for a bit more when you give it to a recycling center. Also, it feels more satisfying when you break it against the head of a weeaboo or Narutard.