Mr Slot Sister Sites

Yes — Mr Slot has a large family of sister sites, and it is not the offshore, unlicensed casino it is sometimes assumed to be. Mr Slot is one brand on a "white-label" platform run by ProgressPlay Limited, a Malta-registered operator that is licensed and regulated in Great Britain by the Gambling Commission. We checked the regulator's own public register: mrslot.com is listed under ProgressPlay's UK licence (account 39335), which was active at our last check. So the honest starting point is the opposite of the usual "offshore, avoid" line: this is a UK-licensed site, and its sisters are dozens of other casinos run off the same platform, under the same company and the same licence.

Below: who actually runs it and what is (and isn't) verifiable about the licensing; a sister-sites table drawn from the regulator's register rather than from copy-paste affiliate lists; and — because "UK-licensed" is a floor, not a gold star — the things genuinely worth weighing before you sign up.

The operator, and what's verifiable about the licence

Mr Slot's own terms name the operator plainly: ProgressPlay Limited, a company registered in Malta, "licensed and regulated in Great Britain by the Gambling Commission under account number 39335," and additionally licensed by the Malta Gaming Authority. We were able to independently verify the UK part: ProgressPlay Limited does hold Gambling Commission account 39335, shown as active, with a remote casino licence in place since November 2014. We did not independently confirm the Malta company-registration number or the MGA licence number on the Maltese registers, so we are not reproducing those figures here as fact — they appear in ProgressPlay's own terms, and you can read them there.

The important thing to understand is the white-label model. ProgressPlay does not really run "a casino called Mr Slot"; it runs one gaming platform and pours it into many differently-branded front ends. Mr Slot is one of those skins. The register lists 192 domains under this single licence — the games, the back office, the payment plumbing, the terms and the customer-support operation are largely shared across all of them. That is the single most useful fact about Mr Slot, because almost everything that follows flows from it.

Mr Slot's real sister sites

These are not "similar casinos we think you'll like." They are brands sitting on the same licence as Mr Slot, taken directly from the domains registered to ProgressPlay's Gambling Commission account 39335. A representative selection:

That is a sample, not the full set. The complete, authoritative list — all 192 domains — is public on the Gambling Commission's domain-names register for account 39335. If you ever want to check whether a casino is a Mr Slot sister, that register is the answer: if the site's terms name ProgressPlay Limited and account 39335, it is family; if they don't, it isn't — regardless of what a "similar sites" list claims.

What to weigh before you play

The operator's compliance record is real and recent. In August 2025 the Gambling Commission fined ProgressPlay Limited £1,000,000, alongside a formal warning and a requirement for an independent audit, for anti-money-laundering and social-responsibility failings covering roughly August 2021 to August 2024. That followed a £175,718 regulatory settlement in May 2022 for similar shortcomings. Treat these as point-in-time findings with agreed remediation rather than a verdict on how the platform runs today — but they are the operator's track record, they are documented, and they are the kind of thing worth knowing before you hand over ID and card details.

The sisters are not really separate casinos. Because Mr Slot shares a platform with its siblings, signing up to several of them mostly gets you the same product with a new coat of paint — the same game library, the same terms, often the same verification and support. Practically, that means a welcome offer you claim at one ProgressPlay brand is not a fresh, unrelated bonus at the next; and if your account is ever restricted, closed or self-excluded, that decision can follow you across the group rather than being escaped by hopping to a sister. That is by design, and it is not something to try to route around.

Being UK-licensed does buy you the protections offshore sites don't offer — use them. Because Mr Slot sits under the Gambling Commission licence, a genuine UK complaints and independent dispute-resolution (ADR) route applies if something goes wrong, and the brand is inside the national online self-exclusion scheme — so a self-exclusion registered through that scheme covers Mr Slot and every other UK-licensed operator at once. That is a real advantage over a truly offshore casino, where none of that safety net exists. One caveat to check for yourself in the terms: UK operators must publish how they hold customer money, and many white-label brands use the lower "funds are not protected" tier, meaning your balance may not be ring-fenced if the company fails — confirm the stated level before you deposit large sums.

Everyday limits sit at the account level. A deposit limit you set applies to your Mr Slot account, not automatically to a sister brand where you hold a separate account — so if you are managing your spending, the cross-operator tool is self-exclusion, not per-site deposit caps. And with any bonus, read the wagering terms on the day: promotional figures date quickly, and the only reliable version is the one live in your account.

The honest verdict

Mr Slot clears the bar that matters most: it is a genuinely UK Gambling Commission-licensed casino, verifiable on the regulator's own register, not an offshore operation slipping UK players in through the back door. That single fact puts it ahead of the non-UK sites it is sometimes lumped in with. What it doesn't do is stand out from its own siblings — it is one interchangeable skin on ProgressPlay's platform — and its operator carries a documented, recent enforcement history. So the sensible way to see Mr Slot is as one of many near-identical entries in a large white-label group: fine to use with eyes open, but judged on ProgressPlay's record and terms rather than on the brand name. If a cleaner compliance history or clearly ring-fenced customer funds matter to you, there are other UK-licensed operators that offer both.

18+ · Play responsibly. If gambling stops being fun, the National Gambling Helpline is free and confidential on 0808 8020 133 (GamCare). The national online self-exclusion scheme lets you block yourself from every UK-licensed online operator at once. Licensing details can be verified on the Gambling Commission public register.