The story
Fiction and adapted settings written by Akitsora Gaming for this title, including invented dialogue and events. This is not a historical or folklore reference. The rules and specification tables define the gameplay and math.
At the turn of the tide, the straits fall still for a single breath.
Then the white water begins to wheel inward toward the eye.
I. Tide-Readers of the Inland Sea
Between the rocky islands of the Seto Inland Sea, narrow channels squeeze the rushing tide until the ocean itself seems to boil with white foam and thunder. Several times a day the current reverses direction with a low roar, and the naval clans who guard these waters live by reading every eddy and seam on the surface.
At the bow of a swift kobaya galley stands the young sea captain, her white headband snapping in the salt wind as spray rises over the timber rails. Raising her brass spyglass to her eye, she watches the slack water ahead dimple and begin to turn in a wide clockwise ring as the tide shifts.
II. Down the Inward Spiral
Instead of dropping down vertical reels, symbols on this board travel along a single inward spiral that starts at the top-left corner and winds clockwise all the way to the centre. Whenever matching symbols touch orthogonally to form a cluster, the current sweeps them away and every remaining symbol slides further down the spiral.
Fresh symbols pour in at the outer entrance as the crew strain at the oars and haul the canvas sail to keep their hull riding the rim of the vortex. Because a single cleared cluster shifts symbols all the way along the winding path, one wave of the tide often sets off another in rapid succession.
III. Power Gathered in the Eye
At the dead centre of the board lies the spinning eye of the whirlpool, holding the round's active multiplier in its vortex. Every winning cascade feeds the current and raises the eye multiplier step by step, multiplying each cluster payout that follows during that spin before the tide settles back to calm water.
Spinning among the regular symbols are wild whirls that bridge clusters across the current. Whenever the sliding spiral carries a whirl all the way into the centre cell, the eye swallows it whole, pulling the entire spiral one cell further inward and surging the multiplier higher in a burst of white foam.
IV. Beacon Fires Over the Great Whirlpool
When enough beacon fires blaze across the island peaks after the cascades settle, the narrow strait roars into the Great Whirlpool bonus round. Throughout these free spins the eye multiplier never resets between spins, carrying its momentum forward from round to round as the water churns faster and deeper.
As the multiplier climbs past a hundred, the captain raises her battle standard into the spray while the whole sea wheels around her ship under the firelight. It is the game's theme, not a promise: the whirlpools of the strait belong to maritime legend, while every spin's outcome is still decided by the RGS random number generator.