What is pill pool?
pill pool meaning a 15-ball game played with three or more players. Each player draws a small bead (“pill”) numbered 1 through 15 from a bottle. The drawn numbers are kept secret. If you pocket your numbered ball before an opponent does, you win. As with 9-ball, the lowest numbered ball must be hit first and you remain at the table as long as you pocket balls.
reference: billiards.colostate.edu: Glossary of Pool and Billiards Terms and Phrases