Manta Mayhem Slot by Play'n GO

The bonus structure here is a pick-your-own-adventure. Three Scatters (or enough collected Pearls) trigger Clam the Prize, where picking a clam determines how many free spins and Boosters you get - anywhere from 6 spins with 3 Boosters up to 10 spins with 5. Then each Booster is another pick. The options range from sticky Wilds locked to reel 2, 3, or 4, to 2 or 3 random Wilds per spin, to a global win multiplier at x2, x5, or x10, to converting one high-pay symbol into a Wild for the entire round. Stacked high-pay symbols on all reels and extra free spins are in the pool too. So two players triggering the same feature play fundamentally different bonus rounds depending on what they pick.

A big blue manta ray hovers behind the grid, wings spread wide, acting as both mascot and Pearl collector. Pearls drop once per reel during base game spins, and the ray scoops them up. The collection itself doesn't build toward a threshold - each grab carries its own random chance to force a Clam the Prize trigger independent of how many you've gathered. Beside the spin button sits the GO Ultra toggle, adding 50% to every bet. It bumps each Clam the Prize outcome by +1 free spin and +1 Booster, which means the top tier becomes 11 spins with 6 Boosters. That extra pick matters more than the extra spin, since landing on a x10 multiplier versus a x2 reshapes the round entirely.

The card royals (10 through A) are drawn as coral-textured shapes in red, green, orange, and blue, while the premium symbols are all cartoon sea creatures - a green pufferfish, orange anglerfish, purple octopus, blue dolphin, and a red crab, all with exaggerated expressions against a deep underwater backdrop of teal coral and seaweed. One quirk worth knowing: free spins don't retrigger. Whatever Boosters you pick at the start are all you get, and the round ends when your spins run out. A Special Expanding Symbol is randomly chosen at the start of each free spins round too, filling entire reels when it lands - if that expanding symbol happens to be the one your HP Wild Booster converted, things stack.