an opportunity to bid. You can't win if you're not in.
The TIC-TAC-TOE slot is one of the most liberal payout slot machines ever made. It has the standard payouts, but at the upper end of the payout scale it has twelve different tic-tac-toe payouts of 18 coins each. Any time three bars show up, no matter where they are on the three reels, the 18 coin payout comes pouring out.