Cluster pays and tumbles
Five or more matching symbols touching side by side or up and down pay. Winners burst, the symbols above fall and new ones drop in, and the tumbles carry on while there are wins.
Rook of Pearlreef: Cluster pays slot with a chess bonus
Win on the reef. Checkmate in the deep.
Coming soon to Stake Request the game sheet
- RTP
- 96.50%
- Max win
- 5,000×
- Volatility
- High
- Release
- Coming soon
The story
A sunlit reef where every sand pit is a reel.
Pearlreef is a shallow coral reef where sunlight falls through the water in shifting patterns. On the sandy floor lies a board of 36 sand pits, and every pit spins as its own reel.
The pieces are cheerful sea creatures: seahorses, sea snails, hermit crabs and jellyfish, with an octopus that fits in anywhere. When enough crowned pufferfish kings gather, the camera leaves the shore and sinks to the deep reef, where a chessboard is waiting.
There, your coral team plays the navy team move by move. You watch: every piece your side captures adds to the win, every piece it loses takes points away, and checkmating the navy king pays the maximum.
Features
What makes it tick
Octopus WILD
The octopus stands in for every paying symbol and joins any cluster it touches.
Parrotfish
When a winning round's tumbles end, a parrotfish can bite the letter symbols out of a whole row. New symbols fall in, always make a new win, and the chain goes on.
Sardine school
A school of sardines can sweep the board and eat every letter symbol at once. What falls in always pays, then the tumbles continue.
Clownfish pearl
At the end of a winning round the clownfish can bring a pearl that multiplies the whole round's win by ×5, ×10, ×20 or ×50.
Pufferfish king SCATTER
The crowned pufferfish never bursts. When the tumbles end, three or more kings open the chess bonus, and more kings give each side more moves, up to 13 at seven or more.
The chess bonus
Watch the deep reef play for you.
The bonus sets up a random mid-game position on a 6×6 chessboard. Both sides play the best move a strong chess engine can find, so every game is real chess. Your coral team moves first.
- Every piece your side captures adds its points, every piece your side loses takes them away.
- When the bonus ends, each net point pays 35× the bet. The bonus never pays less than 0.
- Checkmate the navy king and the round pays the 5,000× max win.
- If your king is mated, the bonus ends and pays the points collected so far.
Piece values
-
Oyster pawn
1 pts
-
Seahorse knight
3 pts
-
Sea snail bishop
3 pts
-
Hermit crab rook
5 pts
-
Jellyfish queen
9 pts
-
Pufferfish king
Checkmate
Scatters and moves
| Scatters | Moves per side |
|---|---|
| 3 | 5 |
| 4 | 7 |
| 5 | 9 |
| 6 | 11 |
| 7+ | 13 |
How to play
A round, step by step
- 01
Set your bet
Choose your stake and press spin. Each of the 36 sand pits spins on its own.
- 02
Build clusters
Groups of five or more matching symbols pay, burst and tumble.
- 03
Meet the fish
In a paying round, parrotfish, sardines and the clownfish can swim in and add to the win.
- 04
Dive for the king
Three or more pufferfish kings take you to the chess bonus in the deep.
Bet modes
Choose how you play
| Bet modes | Cost |
|---|---|
| Base game The standard spin. Land 3 to 7+ scatters to start a 5 to 13 move chess bonus. | 1× |
| Buy 5 moves Bonus buy Start the chess bonus straight away with 5 moves per side. | 50× |
| Buy 7 moves Bonus buy Start the chess bonus with 7 moves per side. | 65× |
| Buy 9 moves Bonus buy Start the chess bonus with 9 moves per side. | 80× |
| Buy 11 moves Bonus buy Start the chess bonus with 11 moves per side. | 100× |
| Buy 13 moves Bonus buy The longest chess bonus: 13 moves per side, the best chance of a checkmate. | 120× |
Specifications
Game details
- Provider
- Red Owl Gaming
- Game type
- Cluster pays slot with a chess bonus
- RTP
- 96.50%
- Max win
- 5,000×
- Volatility
- High
- Grid
- 6 × 6
- Minimum cluster
- 5
- Bonus buy options
- 5
- Languages
- 17
- Devices
- Desktop, tablet, mobile
- Technology
- HTML5, WebGL
- Platform
- Engine
- Release
- Coming soon
FAQ
Questions players ask
What is the RTP of Rook of Pearlreef?
The theoretical return to player is 96.50% in every bet mode, including all five bonus buys.
What is the maximum win?
5,000× the bet. When your coral team checkmates the navy king, the round always pays the maximum win.
How do I trigger the chess bonus?
Land three or more crowned pufferfish kings. Three give 5 moves per side, four give 7, five give 9, six give 11 and seven or more give 13.
Can I buy the bonus?
Yes. Five bonus buys start the chess bonus with 5, 7, 9, 11 or 13 moves per side, from 50× to 120× the bet.
Do I need to know chess?
No. Both sides are played by a chess engine. You watch the match: every capture by your side adds to your win, every piece it loses takes points away.
Can I play on mobile?
Yes. Rook of Pearlreef has its own portrait layout and runs in any modern browser on phones, tablets and desktops.
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