666 Casino Review (2025) - Daily Free Spins Promotions

Launched in 2017, 666 Casino is a popular UK online caisno that invites players to 'Relight Your Fire', with its devilishly fun branding and bold red-and-black aesthetic. Built around a fiery, tongue-in-cheek theme, this established casino site offers a premium selection of slots, table games and live dealer titles from top-tier providers.

My comprehensive casino review covers everything this site has to offer, weighing both the positives and drawbacks to help our players make an informed decision before signing up.

666 Casino operates under the AG Communications umbrella, a company which includes a number of other UK online casinos like Mr Play and Slotzo. 

The site holds a license from the UK Gambling Commission (licence no. 39483), so this is a totally trustworthy place to spend your money and even stand a chance of winning.

The casino welcome bonus at 666 Casino is true to the site’s name: you’ll get up to £66 in deposit match bonus cash and 66 free spins. 

666 Casino Promo Code

You don’t need a 666 Casino bonus code to claim the offer. 

How it Works

• Make your first deposit of at least £20 to get the match
• Free spins are credited when you make a second deposit of £20 or more
• Free spins are valid on Big Bass Bonanza
• Spins expire after 24 hours
• Maximum win of £100 from free spins

Wagering Requirements

Wagering requirements of 35x apply to the 666 Casino bonus. This is in line with other UK online gambling sites. 

Different games contribute differently to the wagering requirements and some are completely excluded. I was disappointed to see that all live casino games are excluded from wagering, as are a few dozen slots. 

Is the 666 Casino Bonus Worth It?

666 might not be the best paying online casino when it comes to the welcome bonus. £66 is less than most other sites offer, I’m more accustomed to seeing a welcome offer of at least £100. The 66 free spins are a nice extra, especially if you enjoy Big Bass Bonanza.

Key Benefits:

✔️ Flexible Double Welcome Bonus - Double welcome bonuses are a great way to get started at a new casino as it gives you a chance to test out a wider range of games on-site

✔️ Top Slot Free Spins - The free spins are to be played on Big Bass Bonanza, which is one of the most popular slot games on the UK market

✔️ Generous Maximum Win - The £100 limit attached to the free spins component of the bonus is quite generous when compared to other casino sites

Who is This Bonus Best For?

✔️ This versatile double welcome bonus is well-suited to any sort of casino player as the bonuses can be used both on slots and classic casino table games

666 Casino offers lots of different promos for regular players. 

You can come back every day to take part in the Daily Spin Frenzy Challenge to bag up to 50 free spins, plus there are tournaments and leaderboards that run in conjunction with the software providers. 

666 Casino has a Rewards program, but at the moment it’s not open to UK players, so I’m hoping it will be expanded at some point in the future. 

You might prefer to stick to simple deposit and withdrawal methods like Visa and Mastercard (or Apple Pay if you’re on an iOS mobile device), but 666 Casino also has other options like PayPal, MuchBetter, Trustly, paysafecard and Skrill.

All deposits are instant and most withdrawals are too, but it’s a good idea to allow up to two days for e-wallets and up to six days for bank card payments.

I followed the full 666 casino login process as part of my review, right from the sign up stage. Once I’d entered my information, I could navigate around the site and see all of the games, but I couldn’t actually deposit until I had submitted my documents. 

Whenever you sign up at a new online casino, you should expect to be asked to verify your account. This is part of licensing and it’s actually a good thing, because it ensures you stay safe. 

I noticed that there’s an option to upload documents directly, so you don’t have to get in touch with support to do it. 

It won’t take more than 48 hours for your documents to be verified, but in my experience it’s usually much quicker at other casino sites. 

666 Casino is home to more than 1,500 of the best online slots for UK players. 

Focus on New Slot Releases

666 Casino claims to add on average 40-50 new games to the site every month, so this already impressive range of slot games is always expanding with the latest releases.

Plenty of Jackpot King Slots

Jackpot King has played a major role in the growing popularity of jackpot slots among UK players, and you'll find a good selection available here. With progressive prizes on well-known titles like The Goonies Megaways and Fishin' Frenzy Megaways regularly reaching seven figures, these games offer a strong appeal for jackpot enthusiasts.

Premium Live Casino

Live casino players are treated to a live dealer section that boasts more than 150 live dealer tables. Provided by Evolution Gaming and Pragmatic Play, you are assured of an authentic live casino experience when playing here. 

I found the mobile casino app experience at 666 Casino a little confusing. I couldn’t find the apps when I searched directly in the App Store and Play Store, but the download links on the site work. 

The apps have okay ratings, but they’re not amazing. Most of the bad reviews were about poor customer support or lack of bonuses, so there doesn’t seem to be anything wrong with the actual app. 

I gave it a try and was pleased to see that all of the games are available and the app worked smoothly on my iOS device. I also had a look at the browser-based mobile site and while it’s not the most modern visually, it worked fine and it was easy enough to navigate.