Ultra Hotfire has been catching plenty of attention, so we put it through its paces to see how it really holds up. AceRun are the software studio behind it, tuning the slot game for a medium low volatility profile, with 94% RTP. Originally released in 2024, it has aged well. If everything lines up, Ultra Hotfire can pay up to 5,000x your bet. It's wrapped in polished, characterful visuals and plays out on a 5-reel grid running 40 paylines. The full verdict is below.
Written by Alex Crawford · Last updated: January 2026
Ultra Hotfire comes to us from AceRun, built with crisp artwork and atmosphere and powered by a 5-reel grid running 40 paylines. The result is a medium low-variance maths model paired with 94% RTP.
Where Ultra Hotfire earns its keep is the feature set. Look out for scatter symbols that unlock free spins and extra bonus rounds. The medium low volatility makes it forgiving on the bankroll, ideal for relaxed, longer sessions. All told, it's a solid entry in the AceRun catalogue.
The RTP of 94% is below the industry average of ~96%. This is common for older slots or those with special features. The lower RTP may be offset by unique mechanics or higher maximum win potential.
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.
Ultra Hotfire 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
Ultra Hotfire by AceRun is a solid offering that delivers good entertainment value. The 94% RTP combined with medium low volatility creates a well-balanced gaming experience.