I stumbled upon Diamond Slam by Enjoy Gaming by accident once too, 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 fills up, the corresponding jackpot is triggered. ZulaCasino recently held a tournament with Diamond Slam on the list of available games. I made it into the top 15 players, which was nice.