How do the expanding reels work?

During free spins, each gem symbol collected adds an extra row to the grid. Starting at 5×3 with 243 ways, it can expand to 5×7 with 16,807 ways to win.

What triggers free spins?

Land 3 or more pearl scatter symbols to trigger 10 free spins with expanding reels. Additional scatters during free spins award +3 spins each.

Diamond Reef Slot Review 2026

Item: Diamond Reef
Rating: 4.0
Author: betcoza.net

Diamond Reef by Blueprint Gaming plunges players into a vibrant underwater world where precious gems hide among coral formations. The expanding reels mechanic starts at 5×3 and can grow to 5×7 during free spins, dramatically increasing win potential. With 96.4% RTP and medium-high volatility, it offers a balanced experience with strong bonus features.

Our Rating

4.0/5

Graphics86%

Gameplay82%

Bonus Features84%

RTP/Volatility80%

Mobile82%

Pros

Expanding reels from 5×3 to 5×7
Stunning underwater graphics
96.4% RTP — above average
Gem collection mechanic for multipliers
Free spins with sticky wilds

Cons

Medium-high volatility may not suit all
Max win 8,000x — good but not exceptional
Complex bonus rules