Sea Queens Slot by Genii

Forty paylines on a 5x4 grid, and every single one of them pays in both directions. That is not the Genii house style. Their catalog is overwhelmingly left-to-right, so seeing a both-ways structure show up here is the first thing worth flagging. The catch keeps it honest: only the higher of the two directional wins on a given line counts, so the feature works as a doubled chance at a hit rather than a doubled payout.

The Wild lives on reels 2, 3 and 4 only. Never the outer reels, which means no five-of-a-kind can complete on Wilds alone, and the two end reels always need a real symbol. Inside that strip the Wild stacks up to three high, and any winning line that includes one fires a flat 2x multiplier. That multiplier is baked into the base game math, not a bonus extra, so a stacked Wild landing across all three middle reels on a payday spin is the realistic path to the upper end of the paytable.

Free Spins are short. Three scatters give you 4 spins, four give 6, and five give the full 8, with scatter pays of 2, 10 and 80 coins attached. The counts are tiny by modern standards, but the round is retriggerable and every win pays double on top. The same middle-reel Wild also changes behaviour during the bonus, swapping from stacked to fully expanding, filling its entire column from top to bottom. The 2x multiplier still rides along, and the round-wide doubler stacks on top of that, so a Wild-assisted line in Free Spins effectively pays 4x. With expanded columns on all three middle reels, both-ways resolution becomes meaningful in a way it rarely does in the base game.

The setting is a coral reef in deep teal water, ornate gold scrollwork around the reel cabinet, multicoloured coral in blue, purple and orange flanking either side, schools of fish in silhouette in the background, light filtering down from the surface. Two mermaid queens sit at the top of the paytable inside red diamond gem frames, one blonde and one redhead, with a turquoise seahorse and purple potion vials beneath them. The card royals are carved stone block letters in mustard, green and pale yellow. The 53,870 coin ceiling, around 673x at the default 4-coin bet, is modest by 2025 standards, and there is no buy option to jump the queue, so the bonus arrives when the scatters land or not at all. For a underwater slot leaning on a feature Genii almost never uses, the both-ways payline structure is the actual reason to spin it.