Halloween bonus slot . THE GAME. Halloween Slot is a 3 reel 1 line classic slot with a progressive jackpot. HOW TO PLAY. Choose the slot machine you wish to play, €/$0.10, €/$0.50,or €/$1.00. Then choose the amount you wish to bet by clicking on the "Bet 1" or "Bet Max" buttons and press "Spin". The Auto Play mode makes the Halloween the ultimate slot machine. If you decide to switch to the Auto Play mode, the Halloween will play for you until you hit the jackpot and then will stop. You can always stop the auto mode by clicking on the stop button. The amount wagered is not deducted from your account until you spin the wheels. If you exit the game before hitting the spin button, you will not lose any credits.