Captain Marlin sister sites

Captain Marlin is not on the Gambling Commission register, and no operator is confirmed. It has 8 lookalike sister sites that share its set-up, though one common owner has not been proven.

Not UK-licensedLast reviewed 8 Nov 2026
Captain Marlin is not licensed in the UK

It is not on the Gambling Commission register. GAMSTOP does not cover it, and UK rules on fair terms, complaints and safer gambling do not protect you there.

UK-licensed offers
Mr Vegas
100% up to £200 + 100 Free Spins
Claim offer
Terms apply
New customers only. Min deposit £20; 35× wagering on bonus; Free Spins on selected slots. 18+. Full T&Cs apply. BeGambleAware.org.
All British Casino
100% up to £100 Welcome Bonus
Claim offer
Terms apply
New customers only. Min deposit £20; 45× wagering on bonus funds before withdrawal. 18+. Full T&Cs apply. BeGambleAware.org.
Duelz
100% up to £100 + 100 Free Spins
Claim offer
Terms apply
New customers only. Min deposit £10; 30× wagering; spins on selected slots. 18+. Full T&Cs apply. BeGambleAware.org.
Midnite
Wager £20, Get 100 Free Spins
Claim offer
Terms apply
New customers only. Free spins are valued at 10p and valid for 7 days. Further T&Cs apply.

8 similar sites

Likely, not proven
Same software, design and payment set-up as Captain Marlin. We have not found a licence or company record that proves one owner.
68/100

SisterScore: our 0–100 rating from thousands of player reviews on trusted review sites and official app stores. Unhappy players post more often, so we adjust for that. Poor is under 40, mixed 40–59, good 60–74, great 75 and up. Scores marked est. are estimates for newer sites: their own reviews so far, blended with the scores of their sister sites (same company, same payments and support). How SisterScore works

CoolCat CasinoCasino
41est.
No verified offer right now
Visit CoolCat Casino
Slotmonster CasinoCasino
68/100
No verified offer right now
Visit Slotmonster Casino
Melbet CasinoCasino
New
Vanguards CasinoCasino
New
No verified offer right now
Visit Vanguards Casino
Grace MediaCasino
New
No verified offer right now
Visit Grace Media
Diceland VIP CasinoCasino
New
Spin Fiesta CasinoCasino
New
Magic Win CasinoCasino
New
400% bonus + 100 free spins
Terms apply
Welcome package of 5 sequential deposits up to £6,000 + 175 free spins with 50x bonus amount only wagering (free-spin winnings included), £15–£40 min deposit depending on method, and 30-day validity; 18+ implied via gambling footer.
Visit Magic Win Casino

UK-licensed alternatives

Most similar first
UK-licensed sites on other licences, closest to Captain Marlin first: the same type of games and a similar SisterScore.
NrgCasino
52/100
Bet £20, get 100 free spins
Terms apply
18+ New customers only. Wager £20 or more on Midnite Casino within 14 days of sign-up. Get 100 Free Spins to use on selected games, valued at 10p and valid for 7 days. T&Cs apply. BeGambleAware.org
Buzz CasinoCasino
51/100
Stake £10 on slots, get 200 spins and a £20 slots bonus
Terms apply
1st deposit only. Stake £10 qualifying slots within 14 days of signup. £20 slots bonus (10p max. spin) on same slots. 10x wagering n
Visit Buzz Casino
Prime CasinoCasino
72/100
Deposit £10, get 100% up to £25 + 50 free spins
Terms apply
Automatically credited upon 1st Deposit (min £10). Max Bonus £25. Game: Big Bass Bonanza, Spin Value: £0.1. WIR 10x free spin winnings (only Slots count). WIR 10x free spin winnings (only Slots count). Max bet is 10% (min £0.10) of the free spin winnings and bonus or £5 (lowest applied). Bonus Policy applies.
Read reviewVisit
SlotStarsCasino
47/100
Deposit £10, get 125 free spins on Big Bass Bonanza
Terms apply
Automatically credited upon deposit. Cancellation can be requested. First Deposit Only. Game: Big Bass Bonanza, Spin Value: £0.10, Max Free Spins: 125, WR 10x Free spin winnings amount (only Slots count) within 30 days, Max bet is 10% (min £0.10) of the Free spin winnings amount or £5 (lowest amount applies). Spins must be used and/or Bonus must be claimed before using deposited funds. Bonuses do not prevent withdrawing deposit balance. Bonus Policy applies.
Visit SlotStars
SlingoCasino
78/100
Deposit £10, get 133 free spins on Big Bass Bonanza
Terms apply
Automatically credited on 1st Deposit (min £10). Game: Big Bass Bonanza, Spin Value £0.1. W<70x free spins winnings (slots only). Max bet: 10% (min £0.1) of the Free spins winnings/£5. Unused expires. Bonus Policy applies.
Read reviewVisit
Smooth SpinsCasino
76/100
Play £10 on Bee Keeper, get 200 free spins
Terms apply
18+ new customers; opt in, deposit and play £10 on Bee Keeper within 7 days; 200 free spins on Bee Keeper; rewards expire after 7 days (T&Cs apply).
Visit Smooth Spins

Captain Marlin sister sites FAQ

Is Captain Marlin licensed in the UK?

No. Captain Marlin is missing from the Gambling Commission register. GAMSTOP does not cover it, and UK complaint routes do not apply either.

What are the Captain Marlin sister sites?

CoolCat Casino, Slotmonster Casino, Melbet Casino, Vanguards Casino and Grace Media lead the list, with three more besides. All share Captain Marlin's set-up, though one owner behind them has not been proven.