If you are looking for something extra, you should check out the progressive slots. These special slot machines are in fact a group of many different slot machines. They deduct a percentage of each coin played on the machines networked in the progressive slots.
It is obvious that the jackpot money increases by leaps and bounds in the progressive slots due to the percentage deducted by each machine being added to the kitty. You can live a life full of lavishness if you ever manage to win the jackpot on any one of the progressive slots.