Best UK Casino Bonuses: December 2025
When you want to play online slots and casino games, a lot of casinos offer casino bonuses for you to enjoy. There won’t be an online casino that you’ll visit, unless it’s a speciality casino, that won’t offer you a casino bonus of some kind for you to take advantage of.
There are quite a few different kinds of online casino bonuses, some which may be more suitable for you than others, but that all depends on the style of how you prefer to play your casino games and slots.
We’ll explain them all in finer detail below, but first, here’s the current best casino bonuses you can enjoy when you’re looking for the next online casino which offers Mega Moolah Jackpot Slot:
Midnite Casino
Bonus: Get 100 No Wagering Free Spins
Promotions: No Wager Bonus
Games Applicable: Big Bass Splash
Bonus Code: BETGETCASINO
licensed by: UKGC
Minimum Deposit: £20
Midnite Casino Terms and Conditions: New customers only. Opt in and wager £20 or more on selected games(Monopoly Megaways, Big Bass Splash, Big Bass Secrets of the Golden Lake, KKC Even Bigger Bananas, Fishing Frenzy Big Catch) within 14 days of registration. Get 100 Free Spins for selected games, valued at 10p and valid for 7 days. T&Cs apply. BeGambleAware.org 18+ T&C's | GambleAware® #AD.
Spinyoo Casino
Bonus: 100% up to £250 Slots Bonus
Bonus Spins: 100 Bonus Spins
Games Applicable: Big Bass Splash
licensed by: UKGC
Minimum Deposit: £20
Spinyoo Casino Terms and Conditions: 18+. New players only. Min Dep £20. Max Bonus Bet £5. Offer: 100% of 1st deposit up to £250 on Slots + 100 Yoo Spins on Starburst, Book of Dead, Fire Joker, Gonzo’s Quest, and Big Bass Bonanza, respectively (first 20 credited immediately upon first deposit; rest credited at 07:00 GMT at 20/day). Spins expire after 23:59GMT on day they’re credited. Winnings from each 20 spins capped at £50 & credited as bonus. Bonus funds expire after 30 days, are separate to Cash funds, & subject to 35x wagering of bonus + deposit amounts. Only bonus funds contribute to wagering requirements. Affordability checks apply.. Full Terms Apply. BeGambleAware.org 18+ T&C's | GambleAware® #AD.
247 Bet
Bonus: 1st Deposit up to £247
Bonus Spins: 100 free spins + 1 Scratchcard
Games Applicable: Big Bass Splash
licensed by: UKGC
Minimum Deposit: £20
247 Bet Terms and Conditions: . New players only. One offer per playerMin deposit £20. Max bonus bet £5. Offer: 100% bonus match on 1st deposit up to £247 + 100 free spins + 1 Scratchcard. Minimum wagering of £20 required to unlock the scratchcard, details & terms sent via inbox. Free spins expire in 72h, winnings capped at £100, credited as cash and are immediately withdrawable. Bonus funds expire in 30 days and are subject to 25x wagering the total bonus & deposit. Only bonus funds count towards wagering contribution. Affordability checks and 18+ T&C's | GambleAware® #AD.
Fruitkings Casino
Bonus: 100% Welcome Bonus up to £50
Bonus Spins: 50 Bonus Spins
licensed by: UKGC
Minimum Deposit: £10
Fruitkings Casino Terms and Conditions: 18+. New players only. 100% bonus on first deposit up to £50 & 100 Bonus Spins (50 spins on day 1, 25 on day 2, 25 on day 3) for Gonzo’s Quest slot only. Min first deposit of £20. Max bonus £50. Max bonus bet £5. Max bonus cash-out £250. 40x wagering requirements. Bonus expiry 30 days. Bonus spins expire after 48 hours. Game restrictions apply. Further Terms Apply. 18+ T&C's | GambleAware® #AD.
Casiku Casino
Bonus: Get 50 No Wagering Spins
Promotions: No Wager Bonus
Games Applicable: Big Bass Splash
licensed by: UKGC
Minimum Deposit: £20
Casiku Casino Terms and Conditions: T&Cs Apply Full T&Cs apply. 18+. New players only. Min deposit £20. Offer: 150% first deposit bonus up to £30 + 50 wager-free spins valid on Big Bass Splash. To claim the spins: min of £20 first cash deposit wagered on slots by 23:59 GMT. Spins credited the next day and valid until 23:59 GMT. Spin winnings credited as cash and capped at £100. Bonus funds are separate to cash funds and subject to 40x wagering requirement (bonus + deposit). Only bonus funds count towards wagering contribution. £5 bonus max bet. Bonus funds must be used within 30 days. Affordability checks apply. Terms apply. 18+ T&C's | GambleAware® #AD.
NYspins Casino
Bonus: Welcome Bonus 100% up to £50
Promotions: no wager bonus,cashback bonus
Bonus Spins: 50 (No Wager Free Spins)
Games Applicable: Book of Dead Slot
Wager Requirement: 30x (bonus + deposit)
licensed by: UKGC
Minimum Deposit: £20
NYspins Casino Terms and Conditions: 18+. New players in GB only. 100% deposit bonus up to £50. Min. deposit: £20. Max Bonus wins: £500. Max bet with active bonus: £2. Wagering requirement: 30x sum of deposit + bonus. 50 Free Spins on Book of Dead only. Winnings from Free Spins credited as real money with no wagering requirement. Maximum Free Spins winnings: £100. Game restrictions apply. Games contribute differently when wagering a bonus. First deposit only, no expiration date. Deposit bonus expiration: 30 days if not wagered. Free spins expiration: 3 days. One bonus per person/address/device/IP. Own payment methods only. www.gambleaware.org Full T&Cs apply. 18+ T&C's | GambleAware® #AD.
Monopoly Casino
Bonus: Play £10, Get 30 Free Spins*
Games Applicable: Paradise Mansion
licensed by: UKGC
Minimum Deposit: £10
Monopoly Casino Terms and Conditions: *New members only, must opt in. Min £10 deposit & wager. 30 day expiry from deposit.18+. Free Spins: on MONOPOLY Paradise Mansion. 1p coin size, max lines. Bingo: Advertised ticket value based on £1 tickets. Game availability & restrictions apply. GambleAware.org #AD 18+ T&C's | GambleAware® #AD.
Casushi Casino
Bonus: Get 20 No Wager Bonus Spins
Promotions: No Wager Bonus
Games Applicable: Big Bass Splash
licensed by: UKGC
Minimum Deposit: £10
Casushi Casino Terms and Conditions: 18+. Only available to new players. Minimum £10 first deposit required. 20 Bonus Spins on Big Bass Splash. No Wagering Requirements. Winnings credited directly to cash balance. Neteller and Skrill deposits excluded. Expiry: bonus spins expire 2 days after deposit. Further terms apply. 18+ T&C's | GambleAware® #AD.
Rainbow Riches Casino
Bonus: Offer: Play £10, Get 30 Free Spins*
Games Applicable: Rainbow Riches Slot
licensed by: UKGC
Minimum Deposit: £10
Rainbow Riches Casino Terms and Conditions: New members only, must opt in. Min £10 deposit & wager. 30 day expiry from deposit.18+. Free Spins: on Rainbow Riches. 1p coin size, max lines. Bingo: Advertised ticket value based on £1 tickets. Game availability & restrictions apply. GambleAware.org #AD 18+ T&C's | GambleAware® #AD.
Knight Slots Casino
Bonus: 125 Free Spins on Big Bass Splash
Games Applicable: Big Bass Splash
Wager Requirement: 30x (bonus + deposit)
licensed by: UKGC
Minimum Deposit: £10
Knight Slots Casino Terms and Conditions: Automatically credited upon deposit. Cancellation can be requested. First Deposit Only. Min. deposit: £10. Game: Big Bass Splash, Spin Value: £0.1. WR 60x 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 before using deposited funds. Bonuses do not prevent withdrawing deposit balance. First Deposit/Welcome Bonus can only be claimed once every 72 hours across all Casinos. This offer is only available for specific players that have been selected by KnightSlots 18+ T&C's | GambleAware® #AD.
GeckoPlay
Bonus: Welcome Bonus up to £80
Bonus Spins: 160 Bonus Spins
Games Applicable: Big Bass Bonanza
licensed by: UKGC, MGA
Minimum Deposit: £20
GeckoPlay Terms and Conditions: Automatically credited upon deposit. Cancellation can be requested. First Deposit Only. Min. deposit: £20, max. Bonus £80. max Free Spins: 160. Game: Big Bass Bonanza, Spin Value: £0.10. WR of 30x Deposit Plus Bonus amount (only Slots count) within 30 days. WR 60x free spin winnings amount (only Slots count) within 30 days. Max bet is 10% (min £0.10) of the free spin winnings and bonus 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. 18+ T&C's | GambleAware® #AD.
Double Bubble Bingo
Bonus: Deposit £10 Play With £50 Bingo
Promotions: no wager bonus
Bonus Spins: or 50 Free Spins
Games Applicable: Double Bubble
licensed by: UKGC
Minimum Deposit: £10
Double Bubble Bingo Terms and Conditions: New members only, must opt in. Min £10 deposit & wager. 30 day expiry from deposit. Free Spins: on Double Bubble. Spins value: 20p each. Bingo: Advertised ticket value based on £1 tickets. Game availability & restrictions apply. 18+. **£10 lifetime deposit required. 18+ T&C's | GambleAware® #AD.
Peachy Games
Bonus: Get 20 No Wager Free Spins
Promotions: no wager bonus
Games Applicable: Big Bass Splash
licensed by: UKGC
Minimum Deposit: £10
Peachy Games Terms and Conditions: 18+. Only available to new players. Minimum £10 first deposit required. 20 Bonus Spins on Big Bass Splash. No Wagering Requirements. Winnings credited directly to cash balance. Neteller and Skrill deposits excluded. Expiry: bonus spins expire 2 days after deposit. Further terms apply. 18+ T&C's | GambleAware® #AD.
Betwright
Bonus: Get 20 Wager Free Spins
Promotions: No Wager Bonus
Games Applicable: Big Bass Slots
Bonus Code: BASS1000
licensed by: UKGC
Minimum Deposit: £20
Betwright Terms and Conditions: New customers only 18+. Promo code BASS1000 required on sign-up. Min deposit £20. Wager £20+ on eligible Big Bass slots to qualify. Receive 20 Free Spins on Big Bass Bonanza 1000. Free Spins have a total value of £2. Spins credited within 24 hours of qualification and expire after 7 days. Standard BetWright T&Cs apply. 18+ T&C's | GambleAware® #AD.
Dragon Bet Casino
Bonus: Get 20 Wager Free Spins
Promotions: No Wager Bonus
Games Applicable: Big Bass Splash
licensed by: UKGC
Minimum Deposit: £10
Dragon Bet Casino Terms and Conditions: The offer is available for new Dragon Bet customers only. Opt in using the promo code ‘bigbasssfreepins' and make a minimum deposit of £10. Deposit a minimum of £10 and receive 20 free spins on Big Bass Splash. The 20 Free spins will be added by 23:59 the day after qualification. 18+ T&C's | GambleAware® #AD.
Grand Ivy Casino
Bonus: Welcome Bonus up to £300
Bonus Spins: 25 Free Spins
Games Applicable: Starburst
licensed by: UKGC
Minimum Deposit: £20
Grand Ivy Casino Terms and Conditions: 18+. New players only. Min. deposit £20. Max. bonus bet is £5. Bonus spins on selected games only and must be used within 72 hours. Winnings from Bonus spins credited as bonus funds and capped at £100. Bonus funds expire in 30 days, unused bonus funds will be removed. Welcome Offer is 100% match up to £300 + 25 bonus spins on your 1st deposit. Bonus funds are separate to Cash funds, and are subject to 35x wagering the total bonus & cash. Only bonus funds count towards wagering contribution. Affordability checks apply. Terms apply. BeGambleAware.org. FULL TERMS IN FOOTER BELOW 18+ T&C's | GambleAware® #AD.
Slot Stars Casino
Bonus: 125 Bonus Spins on Big Bass Bonanza on £10 Deposit
Promotions: low wager bonus
Games Applicable: Big Bass Bonanza
Wager Requirement: x60
licensed by: UKGC
Minimum Deposit: £10
Slot Stars Casino Terms and Conditions: Automatically credited upon deposit. Cancellation can be requested. First Deposit Only. Min. deposit: £10. Game: Big Bass Bonanza, Spin Value: £0.1. WR 60x 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 before using deposited funds. Bonuses do not prevent withdrawing deposit balance. First Deposit/Welcome Bonus can only be claimed once every 72 hours across all Casinos. This offer is only available for specific players that have been selected by SlotStars. 18+ T&C's | GambleAware® #AD.
Voodoo Dreams Casino
Bonus: 100% up to £50 Welcome Bonus
Promotions: low wager bonus
Bonus Spins: 50 Bonus Spins
Wager Requirement: 30x (bonus + deposit)
licensed by: UKGC
Minimum Deposit: £20
Voodoo Dreams Casino Terms and Conditions: 18+. New players in GB only. 100% deposit bonus up to £50. Min. deposit: £20. Max Bonus wins: £500. Max bet with active bonus: £2. Wagering requirement: 30x sum of deposit + bonus. 50 Free Spins on Book of Dead only. Winnings from Free Spins credited as real money with no wagering requirement. Maximum Free Spins winnings: £100. Game restrictions apply. Games contribute differently when wagering a bonus. First deposit only, no expiration date. Deposit bonus expiration: 30 days if not wagered. Free spins expiration: 3 days. One bonus per person/address/device/IP. Own payment methods only. www.gambleaware.org Full T&Cs apply 18+ T&C's | GambleAware® #AD.
Duelz Casino
Bonus: Weekly No Wager Cashback Bonus
Promotions: cashback bonus
Bonus Spins: 100 Bonus Spins
Games Applicable: Book of Dead
licensed by: UKGC
Minimum Deposit: £20
Duelz Casino Terms and Conditions: 18+. New players in GB only. 100% deposit bonus up to £100. Min. deposit: £20. Max Bonus wins: £500. Max bet with active bonus: £2. Wagering requirement: 30x sum of deposit + bonus. 100 Free Spins applicable to Book of Dead only: 20 Free Spins per day for 5 days. Daily login required. Maximum Free Spins winnings: £100. Winnings credited as bonus money with a 45x wagering requirement. Game restrictions apply. Games contribute differently when wagering a bonus. First deposit only, no expiration date. Deposit bonus expiration: 30 days if not wagered. Free spins expiration: 3 days. One bonus per person/address/device/IP. Own payment methods only. www.gambleaware.org Full T&Cs apply 18+ T&C's | GambleAware® #AD.
Miami Dice
Bonus: Welcome Bonus 100% up to £50
Bonus Spins: 50 Bonus Spins On Starburst Slot
licensed by: UKGC
Miami Dice Terms and Conditions: 18+. New players only. Min. deposit £20. Max. bonus bet £5. Bonus spins on selected game only and must be used within 72hrs. Winnings from Bonus spins credited as bonus funds and capped at £100. Bonus funds expire within 30 days. Offer is 100% bonus match up to £300 + 50 Bonus spins on your 1st deposit. Bonus funds are separate to cash funds & subject to wagering requirement (35x deposit + bonus). Only bonus funds contribute towards wagering requirement. Affordability checks apply. Terms apply. Please gamble responsibly. 18+ T&C's | GambleAware® #AD.
Spinstation Casino
Bonus: 400 Bonus Spins On Your 1st Deposit on Big Bass Splash
licensed by: UKGC
Minimum Deposit: £20
Spinstation Casino Terms and Conditions: 18+. New players only. Min. deposit £20. Max. bonus bet is £5. Welcome Offer is 400 bonus spins on Big Bass Splash on your first deposit. Bonus spins must be used within 72 hours. Winnings from bonus spins credited as bonus funds and capped at £50. Bonus funds expire in 30 days, unused bonus funds will be removed. Bonus funds are separate to Cash funds, and are subject to 10x wagering. Only bonus funds count towards wagering contribution. Affordability checks apply. Terms apply. Please gamble responsibly. 18+ T&C's | GambleAware® #AD.
The Best Casinos and the Best Bonuses
Naturally, we’re a casino guide which is all about the best online casinos where you’ll be able to find Microgaming’s Mega Moolah Jackpot Slot. Since we’re an online guide, we are very strict on the online casinos which we recommend to our readers. There’s a lot of which goes into making Mega Moolah Jackpot Slot guide reputable, and the team behind it puts a lot of effort into making sure everything we’re recommending is of the highest standard and that you can trust the casinos which we recommend. This also goes for the casino bonuses that we tell you about as well. If they’re not the best or we don’t think you’ll benefit by them in anyway, then we won’t add them to this website.
Choosing the Best Casino Bonuses
As we said, there are many different types of online casino bonuses which casinos will offer you. Before we go any further, you should know that you don’t have to take a casino bonus when making a deposit at an online casino. Taking a casino bonus is purely up to you and you can refuse it if you prefer to just play with your own money. Casino bonuses are literally free casino money and you are able to win vast amounts of money by using them.
This is why an online casino needs to protect itself and apply what are called ‘wagering requirements’ - this just means if you take money from them in the form of a casino bonus, of which you could win a lot, then there are a couple of rules and requirements you need to adhere to before you’ll be allowed (by the online casino) to cash out the winnings you made from taking the bonus.
That’s why we always recommend reading any Bonus Terms and Conditions before you play, so you know what’s expected of you and if there are any games you want to play which may be excluded from the wagering requirements. As long as you know how it works, then casino bonuses can actually help in your favour.
What’s the purpose of Casino Bonuses?
The purpose of casino bonuses are purely to attract you in the beginning to an online casino (as opposed to a competitor) because they will give you more money when you make a deposit. The money they give you is real money, and you can win real prizes with it.
So therefore, casino bonuses are there to help you play for longer, in some cases bet for higher amounts and generally offer you more entertainment in the casino. Once you’ve taken the initial casino bonus that you’ll be given you make your first deposit at an online casino, and then it won’t be long before you’ll be offered another sort of casino bonus or rewards for your loyalty.
We explain the different kinds of common casino bonuses below, but the sole purpose of these types of bonuses are to keep you playing in the casino you’ve been playing in, instead of going to a competitor. We’ve said it before and we’ll say it again – if you play at an online casino which seems good for you, it often pays to be loyal as you’ll get many rewards for it in the long run.
Different Types of Casino Bonuses
There are a couple of different casino bonuses which are on offer to all players who are looking to play online slots and casino games. Have a look below for each type and description, so you know what to expect when you’re looking for a new slots site and online casino:
Deposit Bonuses: These are the most common types of casino bonus and you’ll be offered a deposit bonus when you play in a new online casino for the first time. The casino will match your deposit and double up the amount, to a specified maximum so you have double to play with. Each casino bonus differs to one another, and you might find some casino bonuses are spread out over your first 3-4 deposits, which can be better value and some offer bigger amounts than others – choose a casino bonus which suits your playing style the best.
Free Spins Bonuses: Free Spins are very common and usually online casinos will not only give you a deposit bonus when you get started, but also some free spins on a specific slot. A very common slot which free spins are given on is Netent's Starburst slot, which is one of Netents most popular and iconic slots. Some free spins will be given simple when you register, and more will follow when you make a deposit, and some will require a deposit. Usually you’ll get far more when you do make a deposit, but some casinos will give you 20 or so free spins no deposit, which will enable you try out a slot for real and see what they are all about. So again, choose a free spins bonus which you think is best for you. All of the casino bonuses we recommend we tell you how they work so its easy to find one you like and one which is best for you
Reload Bonuses: These are exactly what they sound like: Once you have used your deposit bonus then online casinos are keen to keep your patronage and will offer you what’s called ‘reload bonuses’ from time to time, usually on a weekly basis, so that every time you make a deposit, you’ll be rewarded with some unbeatable value to bump up your casino balance which will enable you to play more!
High Roller/ VIP Bonuses: Some people like to bet big, and some online casinos offer large bonuses so that the casino player who wants to bet big every bet or slot spin can do so with the aid of a large casino bonus. This is why, if you intend to deposit a lot of money to do this, you’ll want a big bonus to be credited so that you’ll be able to play for longer periods of time. If this sounds like you, simply look out for the large bonuses which are given on your first deposit. It’s always possible, if you’re not sure, to contact an casino and explain what you're looking for (if you are looking for a high roller casino bonus) as we’re pretty sure they will be only too happy to help!
So there you have it: a brief rundown of online casino bonuses and how they work. As we say, casino bonuses can differ from one casino to the next, so pick the one which is most suitable for you.
All of the casinos we recommend on Mega Moolah Jackpot Guide are all known to give the best casino bonuses time and time again, from your first deposit, and then very good ongoing rewards and promotions too! So we hope you find something that looks like it works for you, in a fun new online casino!