- Up to 20 free spins
- Moving Wilds
- Instant win bonus game
- Medium volatility
- Unknown RTP
Contents
Introduction
Whether you’re fascinated by Victorian London or are eager to get stuck into solving a crime, Detective 221B is certain to appeal. In addition to a strong theme, players can also look forward to moving Wilds, up to 20 free spins and an instant win bonus game that will give you the chance to catch a villain red-handed.
Here’s what else you can expect…
Theme, Graphics & Soundtrack
Explore the streets of Victorian-era London at nightfall and join legendary detective Sherlock Holmes as he solves crimes and tracks down notorious villains. The reels are set against a Victorian building and illuminated by the warm glow of a street light, which creates a slightly eerie atmosphere.
The game’s main soundtrack is both mysterious and intriguing, which clearly suits the overall theme perfectly. The sound of horses and carriages trundling down cobble-stoned streets can also be heard, which further helps to set the scene. The reels make a whooshing sound when they are in motion and an additional soundtrack plays as each reel clicks into place, which heightens the anticipation even more.
As you will come to expect from Mobilots free play slots, the quality of the animations is excellent and every element functions seamlessly to deliver a first-class playing experience.

Detective 221B RTP and Variance
Although Mobilots has chosen not to publish the RTP (return to player) percentage of Detective 221B, we can tell you that it's a medium-volatility online video slot.
How to Play Detective 221B
- Start by clicking on the three-line icon in the top left corner of the screen. This menu contains in-play customisation settings along with the rules of the game, the paytable, win lines and an explanation of the game’s bonus features.
- Next, you can move on to setting your stake. Detective 221B has 30 fixed paylines, so when you click on the coin icon in the bottom left corner of the screen, you will open a menu where you can adjust your coin size.
- When you’re happy with your chosen stake, which will be displayed at the bottom of the screen below the reels, you can start spinning.
- Detective 221B has several spin modes, which means there is certain to be one suited to your playing style. Select the main spin button to engage standard spin mode. Alternatively, hit the lightning bold to activate turbo mode or the plus sign button to engage autoplay mode.
- Your balance will always be visible at the bottom of the screen. Remember to gamble responsibly and when the fun stops, stop.
Bet Sizes & Paytable Wins
Detective 221B has 30 fixed paylines. Its minimum bet is 1.50 and its maximum bet is 150.00. This bet variation will suit most players, from beginners right through to the most experienced.
When the minimum 1.50 bet is in play, the paytable looks like this:
5 x Sherlock Holmes = 25.00
4 x Sherlock Holmes = 5.00
3 x Sherlock Holmes = 1.00
5 x Beautiful Woman = 12.50
4 x Beautiful Woman = 2.50
3 x Beautiful Woman = 0.75
5 x Top Hat Wearing Villain = 8.75
4 x Top Hat Wearing Villain = 2.25
3 x Top Hat Wearing Villain = 0.50
When the maximum 150.00 bet is in play, the paytable looks like this:
5 x Sherlock Holmes = 2,500
4 x Sherlock Holmes = 500
3 x Sherlock Holmes = 100
5 x Beautiful Woman = 1,250
4 x Beautiful Woman = 250
3 x Beautiful Woman = 75.00
5 x Top Hat Wearing Villain = 875
4 x Top Hat Wearing Villain = 225
3 x Top Hat Wearing Villain = 50.00
Detective 221B Bonus Features
Moving Wild
The magnifying glass Wild symbol can substitute for all other symbols on the paytable, aside from the bonus game and free spins symbols. This symbol can therefore help the most fortunate players to land additional winning combinations.
When the moving Wild symbol appears, it will move from right to left across the reels on every spin until it reaches the first reel.
If your session is completed before the moving wild reaches the first reel, it will remain visible during your next session until it completes its journey.
Bonus Game
When three or more gun bonus symbols appear on the reels, players will unlock the bonus game. This bonus game provides instant win prizes, which may boost your overall balance considerably if luck is on your side.
Free Spins
The violin symbol can unlock the game’s free spins round.
5 x violin = 20 free spins
4 x violin = 10 free spins
3 x violin = 5 free spins
If you are someone who enjoys slot games with a free spins round, then you’ll find plenty of options when searching the Slots Temple catalogue by feature. It’s also possible to search by theme, which means that it shouldn’t be long before you come across a new slot that piques your interest.
Our Verdict: Detective 221B Review
If you’re a budding detective and are ready to pound the streets of Victorian London looking for the villain, this Sherlock Holmes themed offering from Mobilots is almost certain to delight. The bonus game, free spins and moving Wilds also help to enhance gameplay, making it suitable for both new and experienced players alike. Do keep in mind that the RTP is unknown and this is a medium-volatility slot, so don’t expect the wins to come pouring in.
If you enjoyed your experience with Detective 221B, we think you will also appreciate Mobilot's Panda Wilds slot. Panda Wilds is a 30-payline, medium-volatility game with a selection of bonuses, including free spins and the chance to unlock giant wins.
Disclaimer: Detective 221B trademark / license is owned by Mobilots. This site is not endorsed by Mobilots.
| Slot Name: | Detective 221B |
|---|---|
| Software: | Mobilots |
| RTP: | N/A |
| Paylines: | 30 |
| Reels: | 5 |
| Min Bet (all lines covered): | £0.05 (GBP) |
| Max Bet: | £50 (GBP) |
| Top Win: | 25 |
| Features: | Bonus Game, Wild Symbol, Scatter Symbol, Free Spins, 5 Reels, Symbol Collection |
| Themes: | Mystery |
| Last Update: | 30/07/2021 |
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No. :maker does not have a UKGC license and cannot offer their games at UK licensed casinos. |
FAQs
What is the RTP of Detective 221B?
This is currently unknown.
How volatile is Detective 221B?
Detective 221B is a medium-volatility online video slot game.
Does Detective 221B have a free spins bonus round?
Yes. Landing at least three violin symbols will unlock the free spins bonus.
How can I play Detective 221B?
Detective 221B can be played on all devices.
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