Mermaids Millions Slot Sites: Top Picks to Play Online in the UK
Written By Jamie Smith
Mermaids Millions is a classic Microgaming slot that is now featured under the Games Global banner, with its excellent slot features attracting players at UK online casinos to this day.
Although the design of the slot does look a little dated now – no surprise given it is now over 20 years old – the Mermaids Millions casino game remains highly playable, with the Treasure Bonus round being one of the highlights.
The top slots sites in the UK for Mermaids Millions boast hundreds, if not thousands, of other great games so players can always find a new favourite to enjoy.
Best Mermaids Millions Casino Sites for 2026
| Position | Casino test reports | Rating | Bonus | Special features | Payout rate | Payout duration | Casino Games | To the provider | General terms and conditions |
|---|---|---|---|---|---|---|---|---|---|
 | |||||||||
| 1 | Casumo | 5.0/5 | 50% Deposit Match up to £100 |
Visa, Mastercard, Skrill, Neteller, PaysafeCard, MuchBetter, Trustly
Pragmatic Play, Play'n GO, Evolution, Playson, Red Tiger, NOVOMATIC, Hacksaw Gaming, Playtech, Big Time Gaming, Relax Gaming, Blueprint Gaming, Push Gaming, Microgaming, Inspired, Quickspin, ELK Studios, Gamomat, Nolimit City, Triple Edge Studios, Thunderkick, NetEnt, Stakelogic, NextGen Gam, Yggdrasil, Slingo Originals, IGT, Skywind, Just For The Win, Pocket Games Soft, Swintt, Gamevy, Scientific Games, Spearhead Games |
97.23% | 1 - 5 days | 3812 | Claim Your Bonus! | Full T&Cs apply. 18+. New customers only. Opt-in required. 50% Deposit Bonus up to £100 on first deposit. Min deposit £20. 10x wagering on bonus amount. Max £5 per bet. Bonus valid for 7 days. Game, play and payment method restrictions apply. Play responsibly • BeGambleAware.org |
| 2 | 32red | 4.9/5 | 150% up to £150 |
PayPal, Debit Card, PaysafeCard, Bank Transfer
IGT, Pragmatic Play, Iron Dog Studios, Relax Gaming, Slingo, ELK Studios, Inspired Gaming, Hacksaw Gaming, Crucible Gaming, Big Time Gaming, , PearFiction, iSoftBet, Rogue, G.Games, Wazdan, Just For The Win, Ino Games, NetEnt, Play'n GO, Games Global, , Prospect Gaming, Wishbone, Reel Kingdom, Nailed IT! Games, Push Gaming, Reel Play, Gameburger Studios, Northern Lights Gaming, Authentic Gaming, OnAir, Evolution Gaming |
96.00% | 1 - 3 days | 2000+ | Claim Your Bonus! | Full T&Cs Apply. 18+ gambleaware.org. [New accounts only. Min. £10 deposit, debit card only. 50x wagering on bonus, Super Spins wagering 30x, game contributions vary, max stake applies. 7 day expiry. |
| 3 | NetBet | 4.8/5 | Up to 500 Free Spins |
Visa, Mastercard, PayPal, Google Pay, PaysafeCard, Yaspa, Payz, Trustly, Wire Transfer
Pragmatic Play, Gaming Corps, Playtech, Evolution, Play'n GO, Gamess Global, Inspired, BF Games, NetEnt, Eyecon, ReelPlay, Red Tiger Gaming, G Games, iSoftBet, Relax Gaming, Ygdrasil, IGT, ELK Studios, Push Gaming, Octoplay, Playson, Hacksaw Gaming, Design Works Gaming, Slotmill, Iron Dog Studio, Bragg, GAMOMAT, Skillzzgaming, Wizard Games, Spinomenal, Spinberry, Spribe, 1X2gaming, Wazdan, Realistic Games, SYNOT Games, Quickspin, Skywind, Stakelogic, RAW iGaming, Red Rake Gaming, NOVOMATIC, RubyPlay, Leander, Tom Horn Gaming, Big Time Gaming, Gaming Realms, Booming Games, Ainsworth, BetGames, Lightning Box Games, Just For The Win, Foxium, Neko Games, Fantasma Games, Slot Factory Games, NextGen Gaming |
95.88% | Up to 24 hours | 3700+ | Claim Your Bonus! | Full T&Cs Apply. *18+ New customers only. £10 min deposit. Opt-in and Bet £10+ on any slot, 100 Free Spins on Big Bass Splash, £0.10 per spin. Winnings paid as cash, £100 Max win. Additional T&Cs apply. GambleAware |
| 4 | Mr Vegas | 4.8/5 | 100% up to £200 |
Visa, Mastercard, PayPal, Neteller, Skrill, Bank Transfer, AstroPay, PaysafeCard
1x2gaming, 2 by 2 Gaming, 4 The Player, Acerun, Ad Lunam, Adoptit Publishing, AGS, Ainsworth, Alchemy Gaming, All 41 Studios, Apparat Gaming, Area Vegas, Armadillo Studios, Asylum Labs, Atlantic Digital, Atomic Slot Lab, Aurum Signature Studios, Authentic Gaming, Avatar UX, Bad Dingo, Bally Wulff, Bang Bang, , , BB Games, Bet Digital, Betixon, BF Games, BGaming, Big Time Gaming, Black Pudding Games, Bluberi, Blue Guru Games, Blue Ring Studios, Blueprint Gaming, Boomerang Studios, Buck Stakes Entertainment, Bulletproof Games, Cayetano Games, Circular Arrow, Coin Machine Gaming, Core Gaming, Crazy Tooth Studio, Crucible Gaming, D-Tech, Design Works Gaming, Electric Elephants, ELK Studios, Evolution Gaming, Eyecon, Fantasma Games, FELT, Fortune Factory Studios, Four Leaf Gaming, Foxium, FunFair Technologies, Gacha Studios, Gameburger Studios, Games Inc, GamesLab, Gamevy, Gaming1, Genesis Gaming, Gold Coin Studios, Golden Rock Studios, Gong Gaming Technologies, Greentube, Hacksaw Gaming, Half Pixel Studios, Hammertime, Highlimit Studio, Hot Rise Games, Hungry Bear Gaming, Hurricane Games, IGT, Indigo Magic, Infinity Dragon Studios, Ino Games, Inspired Gaming, Iron Dog Studio, iSoftBet, Jade Rabbit Studios, Jelly Entertainment, Just For The Win, Kalamba, Leander Games, Leap Gaming, Lightning Box, Lucksome, Magic Dreams, Max Win Gaming, Merkur Gaming, , Microgaming, Nailed It! Games, Neko Games, Neon Valley Studios, NetEnt, NetGaming, NextGen Gaming, Nolimit City, Northern Lights Gaming, Old Skool Studios, OnAir, One Touch Games, Oros Gaming, Pariplay, Pear Fiction Studios, Peter & Sons, PF Soft, Pixiu Gaming, Play'n GO, Playson, Playtech, Playzido, Pragmatic Play, Print Studios, Prospect Gaming, Pulse 8 Studios, Push Gaming, QuickSpin, Rabcat, RAW i Gaming, Real Dealer, Realistic, Red 7, Red Rake Gaming, Red Tiger, Reel Time Gaming, ReelPlay, Reflex Gaming, Relax Gaming, Revolver Gaming, Ruby Play, S Gaming, SG Digital, Shuffle Master, Side City, Silverback, Skillzzgaming, Skywind, Slingo, Slingshot Studios, Slot Factory, Snowborn, Spreadhaed Studios, Spin On, Spin Play Games, Spinberry, Spinomenal, Stakelogicm STHLMGAMING, Storm Gaming, Stormcraft Studios, Switch Studios, SYNOT Games, The Games CO, Thunderbolt Gaming, Thunderkick, Tom Horn Gaming, Tochstone Gaming, Trigger Studios, Triple Edge Studios, Wazdan, Welly, Wild Streak, Williams Interactive, Wishbone, Wizard Games |
97.17% | 1 - 5 days | 7500+ | Claim Your Bonus! | Full T&Cs Apply. 18+. New Casino players only. Min. deposit £10. 35x wagering applies within 60 days. Play responsibly. |
| 5 | All British Casino | 4.7/5 | Deposit and wager £10 for 100 Cash Spins |
Visa, Mastercard, PayPal, Neteller, Skrill, Trustly
Amatic, Blueprint, Evolution, IGT, Microgaming, Novomatic, NextGen, Play'n GO, Pragmatic Play, Relax Gaming, Stakelogic, Eyecon, Thunderkick, Big Time Gaming, Inspired, Hacksaw Gaming, NetEnt, Red Tiger, Slingo, ELK Studios, No Limit City |
95.98% | 1 - 5 days | 2689 | Claim Your Bonus! | New players only | Deposit & wager at least £10 to get free spins | Free Spins winnings are cash | No max cash out | Eligibility is restricted for suspected abuse | Skrill deposits excluded | Free Spins value £0.10 per spin | Free Spins expire in 48 hours |18+ Full T&Cs Apply. GambleAware.org Play Responsibly |
Read on for full details about how to play Mermaids Millions, how the slot features work and what slot symbols pay the most when spinning the reels of the slot game.
Overview of the Mermaids Millions Slot Game
Mermaids Millions in Brief:
- Release Date: 18 May, 2005
- Type: Video Slot
- Theme: Fantasy
- Software Studio: Microgaming
- RTP: 96.56%
- Volatility: Low-Medium
- Special Features: Wilds, Multipliers, Free Spins
- Bonus Rounds: Free Spins
- How to Trigger Bonus Round: Land 3 or more Scatter Symbols
Mermaids Millions has a classic look and feel, with a slightly old-fashioned design ensuring that the 20-year-old slot is beginning to show its age. But the slot plays better than a lot of new slots out there, with its continued appeal timeless.
More About Online Slots
Full Rules & Information About the Mermaids Millions Online Slot
The 5×3 grid of reels on Mermaids Millions provides 15 paylines, so the layout is a classic format that remains in use on a lot of new slots these days.
Mermaids Millions Factsheet
| Reels | 5 |
| Rows | 3 |
| Paylines | 15 |
| Multipliers | Yes |
| Gamble Feature | No |
| Free Spins | Yes |
| Bonus Games | Yes |
| Jackpot | No |
| Min Bet | £0.20 |
| Max Bet | £5 |
Multipliers come into play during the free spins bonus round on the Mermaids Millions slot.
Mermaids Millions Symbols & Payouts
Ocean-themed slot symbols pepper the reels on Mermaids Millions, with the classic A-10 icons giving an underwater design to match the rest of the game’s look.
A seahorse, gems and a clam are among the higher-paying slot symbols on the Microgaming game, while the slot’s scatter symbol also pays out if at least two appear. For any other symbol, players need three on a payline to create a winning combination.
- All symbols: 10
- Highest-Paying Symbol: Scatter
- Wilds: Wilds
- Paylines Pay: Left to Right
- Maximum Win: 1,655x the stake size
Mermaids Millions Bonuses & Features
The Treasure Bonus is one of the main extra slot features on the Mermaids Millions game. Get three of the Treasure Bonus symbols to enter the bonus round, which is a pick and click game where players can select three items that all have different levels of cash prizes inside to add to their win.
Three scatters gets access to the free spins bonus round on Mermaids Millions, where all wins that are recorded get boosted by a 3x multiplier. While 10 free spins are initially awarded, more scatters can retrigger the bonus game as well.
It is even possible to trigger the Treasure Bonus game on Mermaids Millions while playing through the free spins bonus round, which racks up even bigger wins.
Similar Games & Best Alternatives
Mermaids Millions has an ocean theme, with one of the new slots to have a similar design being the 2025 release Mermaid’s Treasure Trove that came out from the renowned slots studio Pragmatic Play.
Top Microgaming slots to try out for those who like Mermaids Millions include Mega Moolah – which boasts huge jackpot prizes – and the ever-popular 9 Masks of Fire slot game.
Short, Playful Title
Mermaids Millions is widely considered to be a casino classic, with enjoyable gameplay that beats many new slots that come out at UK online casinos, though a max win of 1,655x is definitely on the low side. Low-medium volatility helps to make amends.
The bonus games are full of fun and action, with the free spins round including a 3x multiplier that means potential payouts can rack up quickly. Well worth a spin to roll back the years.