There is a "Jackpot" bonus that will increase as other players play the game and resets when someone wins it. There is a link to the Jackpot winner history. Every time you spin, you'll fill the "Bonus Meter". By filling the bonus meter, you'll get a chance (by spinning a wheel, not a slot machine) to earn some Reward Points (5, 10, or 20) or a rare loot item (listed below). The "Bonus Meter" is full after 20 spins. After you use the bonus spin, the meter resets.