Grimoire of the Deep Slot Demo by 4phantom

Grimoire of the Deep by 4phantom Slot Overview

Grimoire of the Deep by 4phantom wraps a mystical underwater expedition in dark blue tones, golden detailing, and ancient relic imagery. The 7×7 grid and treasure-hunt symbols give it a polished, atmospheric look that suits its exploratory theme.

Its standout mechanics are cluster wins, tumbling symbols, persistent multipliers up to 1024x, and Free Spins with retriggers. The 25,000x max win adds long-term appeal, so it is worth trying it — for now, the free demo is only available on Stake, and the button above brings you directly to the site.

Grimoire of the Deep Slot Specifications

Grimoire of the Deep uses a 7×7 grid and cluster pays, so wins come from connected symbols rather than fixed paylines.

RTP (Return to Player)

With 95.9% RTP, Grimoire of the Deep sits around average and supports fair long-term returns for an online slot.

Volatility

This is a high volatility slot, so wins may come less often, but the bonus features can drive stronger swings.

Max Win

The 25,000x max win gives players a solid top-end target, especially when multipliers start building during free spins.

Theme

The underwater cave setting feels dark and mysterious, with treasure-hunt visuals that suit the 4phantom slot’s adventure style.

Grimoire of the Deep Slot Features

Grimoire of the Deep combines cluster pays, tumble wins, persistent multipliers, Free Spins, and several Bonus Buy options, all built around a 7×7 grid and escalating win potential.

Cluster Pays

Wins land when five or more matching symbols connect horizontally or vertically on the 7×7 grid. This cluster system replaces fixed paylines and keeps each spin flexible. Winning symbols disappear, new ones drop in, and tumble sequences can create extra wins from one spin.

Multipliers

Winning positions become active and can build multipliers when they win again. Each repeat win on the same position doubles the value, starting at 2x and climbing to 1024x. In the base game, these multipliers last for the spin and its tumbles.

Free Spins

Land 3 or more Scatter symbols to trigger Free Spins. Three Scatters award 10 spins, while 4, 5, 6, and 7 Scatters award 12, 15, 20, and 30 spins. Multipliers persist throughout the round, and retriggers add more spins.

Bonus

The Bonus feature plays the same as naturally triggered Free Spins, but you buy direct access instead of waiting for Scatters. It awards 10 to 30 Free Spins based on the number of Scatters shown, with the same multiplier behaviour and retrigger rules.

Super Bonus

Super Bonus is a purchased Free Spins variant that cannot trigger in normal play. It awards 3 to 7 Scatters, starting the round with all positions on x2 multipliers. These positions then double normally during play, which can create stronger early momentum.

Bonus Buy Options

This feature lets you buy feature access or improve the chance of triggering Free Spins.

• ENHANCED (x3): Makes Free Spins roughly five times more likely.
• Bonus (x100): Awards 3 to 7 Scatters for Free Spins.
• POWER UP X64 (x1000): Starts the board with x64 multipliers.
• Super Bonus (x500): Awards 3 to 7 Scatters with x2 positions active.

Grimoire of the Deep Slot Review

Grimoire of the Deep builds its identity through a 7×7 cluster layout, deep blue underwater caves, and gold framed relic imagery. The theme is specific rather than generic pirate fare, but the atmosphere depends more on the game’s stone interface and treasure symbols than on any dramatic presentation.

On the reel action, the main draw is the multiplier system, since repeat wins on the same position can climb to 1024x. That gives the slot a clear mechanical edge, but the 95.9% RTP and high volatility mean the base game can sit tight until the bonus structure or tumbles do the work.

Grimoire of the Deep suits players who want cluster pays, persistent multipliers, and a serious top cap of 25,000x without unnecessary extras. It should appeal most to people who enjoy feature driven online slot gameplay, while players wanting fast regular returns may find the waiting too obvious.

Grimoire of the Deep Slot FAQ