Our review of Heartburst cuts through the marketing and looks at what matters: how it plays and how it pays. Eyecon are the developer behind it, tuning the title for a very high-variance maths model, with a published RTP of 95.05%. Top wins are capped at 150,000x your stake, a genuinely massive ceiling for the patient. You get a 5-reel grid running 40 paylines, all wrapped in polished, characterful visuals. Let's break down what works and what doesn't.
Written by Michael Torres · Last updated: January 2026
Heartburst is a title from Eyecon, finished with a clean, modern look. It runs on 5 reels and 40 paylines with a very high-variance maths model, and 95.05% RTP.
Dig into the bonuses and Heartburst starts to stand out. Look out for scatter symbols that unlock free spins and extra bonus rounds. With very high variance, this one is aimed at players who can ride out the swings for the top wins. Overall it's a well-rounded title that knows what it is.
At 95.05%, 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.
Very high volatility delivers the most extreme payout profile — long dry spells punctuated by potentially massive wins. Only recommended for experienced players with substantial bankrolls and high risk tolerance.
About 1 in 3 spins results in a win. This is a moderate hit frequency that balances win frequency with payout size.
Heartburst 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
Heartburst by Eyecon is a solid offering that delivers good entertainment value. The 95.05% RTP combined with very high volatility creates a well-balanced gaming experience.