Before you load Cannon Thunder for real, spend a couple of minutes on how it genuinely performs. Built by Merkur, it lands as a slot with a high-variance maths model and a return-to-player rate of 95.98%. The maximum win sits at 20,000x, so there's serious upside on the table. You get a 5-reel grid running 30 paylines, all built with crisp artwork and atmosphere. Dating back to 2020, it remains a regular pick. But is it actually worth playing? Read on.
Written by Michael Torres · Last updated: February 2026
At its core, Cannon Thunder is a release produced by Merkur, given an engaging visual treatment. It runs on a 5-reel grid running 30 paylines with high variance, and a return-to-player rate of 95.98%.
Where Cannon Thunder earns its keep is the feature set. Look out for scatter symbols that unlock free spins and extra bonus rounds. The high volatility means patience is rewarded — expect quiet spells broken by bigger hits. On balance, Cannon Thunder is a dependable option worth a few spins in the demo first.
At 95.98%, 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.
High volatility means longer gaps between wins, but when wins do land, they can be significantly larger. A bigger bankroll and patience are recommended for this type of slot.
About 1 in 3 spins results in a win. This is a moderate hit frequency that balances win frequency with payout size.
Cannon Thunder 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.
3.0 / 5 — Good
Cannon Thunder by Merkur is a solid offering that delivers good entertainment value. The 95.98% RTP combined with high volatility creates a well-balanced gaming experience.