Queen of Sirens Slot by Evoplay

Everything on this grid is a bonus symbol. No regular paylines, no line wins - coins sit on every position with bet multipliers stamped on their faces, and the only way to collect is triggering the hold-and-win round. Three matching symbols across the central row start it, resetting 3 respins each time something new sticks. Two buy-in options skip the wait: 30x for a standard bonus, 75x for the Ultra variant.

The Octopus is what separates this from a generic coin collector. It lands with no value of its own but absorbs every coin value and jackpot currently on the grid into one combined payout. A red-haired mermaid watches from the left side of the screen, posed against sunken columns and deep blue water with a giant turquoise shell releasing bubbles on the right. Sticky Coins (5x-9x bet) persist between base game spins until a bonus fires, so the grid slowly loads up before each trigger. Mystic symbols resolve into any other type at the end of the bonus round, and the Mystic Jackpot version locks in one of three fixed jackpot tiers - Grand at 500x, Major at 50x, or Minor at 20x.

Luck of Aurora sends 1 to 9 comets into random cells during the bonus, each adding a x2 multiplier. Hit the same cell twice and the multiplier stacks. The Ultra Bonus Game guarantees Aurora fires at the start and repeats it more frequently, which is where the 4,313x cap becomes reachable - a loaded grid with stacked multipliers feeding into a single Octopus collection. Gold of Sirens runs a similar underwater collector setup but without the Aurora multiplier layer.