Our review of 221B Baker Street cuts through the marketing and looks at what matters: how it plays and how it pays. Merkur are the software studio behind it, tuning the release for a medium high volatility profile, with 95.98% RTP. Expect a hit frequency around 30%, which sets the rhythm of play. Top wins are capped at 20,000x your stake, a genuinely massive ceiling for the patient. You get 25 paylines across 5 reels, all leaning into a horror aesthetic. Here's how it stacks up.
Written by Sophie Williams · Last updated: March 2026
221B Baker Street comes to us from Merkur, wrapped in a horror theme. It runs on 25 paylines across 5 reels with medium high volatility, and a return-to-player rate of 95.98%.
The mechanics are what make 221B Baker Street interesting. Look out for scatter symbols that unlock free spins and extra bonus rounds. The medium high volatility strikes a middle ground that should suit most playing styles. All told, it's a solid entry in the Merkur catalogue.
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.
Medium-high volatility means wins come less frequently but tend to be larger when they hit. Players should be prepared for dry spells between bigger wins, requiring a moderate bankroll.
About 1 in 3 spins results in a win. This is a moderate hit frequency that balances win frequency with payout size.
221B Baker Street 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
221B Baker Street by Merkur is a solid offering that delivers good entertainment value. The 95.98% RTP combined with medium high volatility creates a well-balanced gaming experience.