Our review of Cluster Gems cuts through the marketing and looks at what matters: how it plays and how it pays. Developed by Zillion Games, Cluster Gems arrives with medium low volatility and an RTP of 95.48%. If everything lines up, Cluster Gems can pay up to 5,000x your bet. It's built with crisp artwork and atmosphere and plays out on a grid that rewards clusters rather than paylines. It first went live in 2025 and still earns its place today. Here's how it stacks up.
Written by Emma Roberts · Last updated: February 2026
Cluster Gems comes to us from Zillion Games. Presentation-wise it's finished with a clean, modern look, and it leans toward medium low volatility at a published RTP of 95.48%. Under the hood you'll find a cluster-pays grid instead of fixed lines.
Dig into the bonuses and Cluster Gems starts to stand out. Look out for scatter symbols that unlock free spins and extra bonus rounds. Thanks to its medium low variance, wins come often enough to suit casual, lower-risk play. Overall it's a well-rounded slot that knows what it is.
At 95.48%, the RTP is slightly below the industry average of ~96%. While this is typical for many popular slots, players should be aware of the slightly lower theoretical return.
Medium-low volatility offers a good balance of regular wins with occasional larger payouts. Expect frequent hits with modest amounts, suitable for casual players who want low-risk entertainment.
About 1 in 3 spins results in a win. This is a moderate hit frequency that balances win frequency with payout size.
Cluster Gems features scatter symbols that can trigger free spins rounds. Landing the required number of scatter symbols anywhere on the reels activates the free spins feature, giving you extra chances to win without additional bets. During free spins, special modifiers may apply to boost your winning potential.
Instead of traditional paylines, Cluster Gems uses a cluster pays system where wins are formed by groups of matching symbols touching horizontally or vertically. The larger the cluster, the bigger the payout. This mechanic opens up many more potential winning combinations than fixed paylines.
3.0 / 5 — Good
Cluster Gems by Zillion Games is a solid offering that delivers good entertainment value. The 95.48% RTP combined with medium low volatility creates a well-balanced gaming experience.