Shafts of sunlight slant down through the sea onto the ruins of a sunken temple: broken columns, coral-covered steps, and an arch half buried in the sand.

Poseidon stands on the temple plinth with his trident. Dolphins drift around him, and a school of small fish slips between the corals.

The temple keeps the sea god’s treasures: his trident, his crown, a golden conch and a golden seahorse, and shells that shine with mother-of-pearl — a coral-red scallop, a deep-blue sea snail, an amethyst starfish, an emerald abalone and an amber coral branch.

When 8 or more of the same treasure appear, the sea god thrusts his trident — they need not sit in a row. A jet of water strikes them, the chosen treasures break into glittering mother-of-pearl and bubbles, and new ones fall into their places at once.

Now and then a pearl bearing a multiplier drifts down. A dolphin swims in, takes it and carries it into the win in a trail of bubbles — a sea pearl counts only at the moment the sea god chooses a treasure (×2 to ×20), then it is gone.

When 4 trident coins blaze at once, the sea god strikes the seabed — currents link the coins, a whirlpool draws in their light, and a great wave rolls across the temple. The surface darkens to moonlight and blue fires light up one by one.

At night one thing changes: every sea pearl stays. The multipliers stack (×2 to ×500) and remain until the moon has set.

Four gold plaques hang at the top of the temple — Mini, Minor, Major and Grand.