Atlantis World Slot by GameArt

The reels drop straight into a drowned city - ruined Atlantean columns fading into deep blue water, shafts of light cutting down from somewhere far above, the whole grid bordered in gilded coral and pearl. Poseidon glares out from the high pays with his white beard and trident, alongside a pink-haired mermaid, a golden seahorse, and a leaping golden dolphin. Jewelled card royals fill in the low end, each letter set in an ornate gold plaque. It's an older GameArt title and it looks its age in places, but the art holds up better than most slots from that era.

The dolphin does double duty. It's the top symbol and the Wild, and it lands in full stacks - a single reel can come back covered in dolphins, which is where most of the bigger base-game hits come from across the 50 lines. It fills in for everything except the Sphere, a golden astrolabe that acts as the Scatter. You need three Spheres, and they only count on the middle three reels, so the trigger is locked to reels 2, 3, and 4 rather than scattered anywhere on the grid.

That lands you five free spins. The hook is that the bonus runs on its own reel set seeded with extra stacked dolphin Wilds, so the same full-reel coverage that's occasional in the base game becomes the norm during the round. Catch three more Spheres mid-bonus and you tack on another five. With only five spins to start, those retriggers are doing real work - a single one nearly doubles the round.

Beyond that it's lean. No buy option, no jackpots, just the standard GameArt card gamble waiting over each win if you want to risk a payout on a red/black or suit guess. Five free spins and a stack of dolphins is the entire feature set, which is light by current standards, though the 2,121x ceiling tells you the math can still run when those bonus reels fill.