u/TrubluPlays

I know how the Billiard Room Puzzle works. >!Blue is add, pink is subtract, yellow is Multiply, press the number that is the answer.!<
Except the mathematical answer to this question is 100. Which isn't on the board. (9-4=5. 5*20=100.)
So I just tried pushing every button on the board.

...the answer was 16.
HOW IS IT 16??? I have to be missing something here, I've been staring at it for minutes, I can't figure it out. Please help.