Things are starting to turn in your head, like coffee on a slow morning. The ideas and realization has been starting to stir up your brain cells.

The papers are bothering you and you consider keeping them for safe keepings and then the key under the black ball draws the question. The question to what it's for has come into the situation and why it's hidden under a black ball has become a 'stupidity question'.

All these items could be useful to have or find out what they are for, but knowing too much could prove lethal . . .

Pocket Black Ball and Numbers, for leverage
Take the Key and go into the Hall

. . . hope you don't have any doubts about this game!