Merkur Gaming

221B Baker Street

Slots Video Slots Mystery History Darkness Detective Europe Guns Tv

Detective slot combining a risk decision with multiplied Free Spins

SlotRanker Score

/ 99

05099

The SlotRanker Score is calculated from the visible data below. It is not affected by affiliate deals, and it cannot be bought.

How this score is built

RTP

96%

return to player

Volatility

Medium volatility

variance

Max win

—

top multiplier

Min bet

$0.20

per spin

Reels

20 lines

Player rating

4.0 ★

11 votes

DEMO Play free, no signup

Merkur Gaming

Embed on your site

4.0 / 5

11 ratings

User ratings are shown separately from the Slot Score unless stated otherwise.

Five weighted signals shape the composite. Four context signals refine ties. See how we rate for the full methodology.

Payouts & RTP9/10

RTP 96% → 9.0/10

Volatility8/10

medium → 8.0/10

Win Potential—

no data

Features7.5/10

10 features → 7.5/10

Game Mechanics5.4/10

f=10 r=5 p=20 → 5.4/10

Context signals (tie-breakers)

Layout6/10

5x3 → 6.0/10

Bet Flexibility6/10

0.2–40 (×200) → 6.0/10

Provider Reputation5.9/10

provider avg 5.9 → 5.9/10

Popularity0/10

synthetic proxy → 0.0/10

Popularity blends real player search demand (~30 markets) with a catalogue-derived proxy; games without measurable search demand use the proxy alone. Not live play telemetry.

Cite this score

SlotRanker Score: 62 — 221B Baker Street by Merkur Gaming

https://slotranker.com/merkur-gaming/221b-baker-street#score

How to cite

Slot Summary

Accept the current duel prize or risk it on another confrontation: that decision gives 221B Baker Street its sharpest break from routine line play. Merkur Gaming places the choice beside a separate Free Spins route, substitution Wilds, and win multipliers. The 96% RTP and medium-volatility profile keep the detective theme attached to a conventional 5x3, 20-payline structure.

How It Plays

The base game runs across a 5x3 layout with 20 selectable paylines. Pressing spin deducts the chosen stake before the reels resolve the line results.

Special symbols interrupt that routine in different ways. Big Ben symbols lead toward Free Spins, while the Duel trigger presents an accept-or-risk decision outside the reels.

Theme & Atmosphere

The Detective and Mystery labels frame Baker Street as a case file rather than a generic city scene, with Darkness supporting the criminal tension.

Europe, History, Guns, and Tv references place the presentation in a recognizable screen-detective tradition, using pursuit and confrontation to organize the feature scenes.

Mystery History Darkness Detective Europe Guns Tv

Features & Win Potential

The Wild Symbol provides Substitution Symbols behavior, replacing ordinary symbols but not the two Scatter Symbols when it helps form a payline result.

Free Spins add a Multiplier to qualifying awards. The number of spins and the possible multiplier depend on how many Big Ben trigger symbols appear.

Free Spins Multiplier Scatter Symbol Wild Symbol Medium/High Medium volatility 5 Reels 96% RTP 20 Paylines Substitution Symbols

Bonus & Free Spins

Three, 4, or 5 Big Ben symbols can award as many as 6, 14, or 20 Free Spins, with a multiplier reaching 5x.

The Free Spins use all 20 paylines and retain the initiating stake. Ordinary wins during the round receive the selected Multiplier before the feature total is settled.

Spec sheet

221B Baker Street at a glance.

Identity

Slot name221B Baker Street

StudioMerkur Gaming

Released2/11/2015

Math

SlotRanker Score62

RTP96%

VolatilityMedium volatility

Max win—

Bet range$0.20 – $40.00

Player rating4.0 / 5 · 11 votes

Format

Reels5

Paylines20

Layout5x3

Features

Themes

Expected average based on this slot's 96% RTP — individual sessions vary with volatility.

Bet per spin

Spins per hour400

Session length (hours)

Cost per hour$3.20

Cost per session$3.20

Estimate only, for entertainment purposes — treat gambling as entertainment, not a way to make money, and set a budget you can afford to lose.

How long could a bankroll last on 221B Baker Street? We simulate thousands of sessions from this game's published RTP and volatility — the long-run math, not a prediction of your next spin.

Bankroll ($)Bet per spin ($)Speed

Volatility tier: Medium

Running simulation…

How this works

Each simulated spin either misses or returns a win drawn from a log-normal distribution, with the hit rate and spread set by the slot's volatility tier (Medium). The model is calibrated so the average return equals this slot's published RTP (96.00%), with wins capped at its top multiplier (1,000×).

This is a simplified, parametric model of the game's math — not its real paytable. It exists to make the house edge visible over many sessions, so the numbers above are averages across thousands of runs, never a forecast of one.

This is math, not a prediction. Real sessions vary wildly, and no strategy changes a game's built-in house edge. Play for fun, set limits, and never bet more than you can afford to lose.

Where to play 221B Baker Street

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Compare 221B Baker Street with other games

	221B Baker Street Score 62This game	The Invisible Man Score 78	A Dark Matter Score 76	Mystery Express Score 73	Hyde & Seek Score 67
Identity
Studio	Merkur Gaming	NetEnt	Slingshot Studios	IGT	Massive Studios
Released	2/11/2015	12/11/2014	10/22/2019	4/23/2020	2/23/2025
Math
RTP	96%	96.3%	96.18%	96%	96.59%
Volatility	Medium volatility	Medium volatility	High volatility	Medium volatility	—
Max win	—	—	—	41,667×	2,000×
Format
Reels	5	5	5	5	5
Layout	5x3	5x3	5x3	5x3	5x4
Paylines	20	20	5	30	—
Min bet	0.2	0.2	0.05	0.3	0.1
Max bet	40	10	50	600	100
Features
Progressive	—	—	—	—	—
Wild symbol	✓	✓	✓	✓	✓
Free spins	✓	✓	✓	—	✓
Scatter symbol	✓	✓	✓	—	✓
Multiplier	✓	✓	✓	✓	—
Bonus game	—	✓	—	✓	—
Respins	—	✓	—	—	—

Every number is shown as a delta against 221B Baker Street.

Comparing against

221B Baker Street

Merkur Gaming

RTP

96%

Max win

—

Score

+ Bonus Game+ Respins

+ Bonus Game− Free Spins− Scatter

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