I also stumbled upon Diamond Slam by Enjoy Gaming by accident, and now it’s one of my favorite slots at this casino. The progress bars you saw are actually the game’s main feature, the Jackpot Slam mechanic. I read about it on the official Zula casino site . During each spin, you collect special tokens that fill four separate scales: Mini, Minor, Major, and Grand. As soon as a scale is filled up, the corresponding jackpot is triggered. ZulaCasino recently held a tournament that included Diamond Slam. I made it into the top 15, which was nice.