Madoka does know plenty of games you can play even without needing anything special, so that shouldn't be too much of a problem. Which is why she doesn't remark anything about that problem, but it does make her think of something.

"Do you think there are maybe boardgames somewhere on the train? Has anyone found them before?" Now that'd be something fun to play with a whole group of people. "Like.. um.. Chutes and ladders! That one is so much fun!"