Big Bonus Booster has been catching plenty of attention, so we put it through its paces to see how it really holds up. Inspired Gaming are the team behind it, tuning the slot game for a very high-variance maths model, with an RTP of 95.18%. Top wins are capped at 250,000x your stake, a genuinely massive ceiling for the patient. Visually it's wrapped in polished, characterful visuals, with the action running on a straightforward 6 reels layout. Originally released in 2023, it has aged well. Let's break down what works and what doesn't.
Written by Sarah Mitchell · Last updated: January 2026
Big Bonus Booster is a title from Inspired Gaming, wrapped in polished, characterful visuals. It runs on 6 reels and a familiar payline structure with very high variance, and a published RTP of 95.18%.
The mechanics are what make Big Bonus Booster interesting. 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. On balance, Big Bonus Booster is a dependable option worth a few spins in the demo first.
At 95.18%, 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.
Big Bonus Booster 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
Big Bonus Booster by Inspired Gaming is a solid offering that delivers good entertainment value. The 95.18% RTP combined with very high volatility creates a well-balanced gaming experience.