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300% SLOTS DEPOSIT BONUS

Last Updated: December 27, 2024

A 300% slots deposit bonus gives you quadruple the amount of money to play with. So, for example, if you deposit £10 and get a 300% bonus, then you will receive an extra £30, giving you a total of £40 to play slots with.

Below we have created a list of the best UK slot sites offering 300% casino deposit bonuses. All the casinos adhere to UK gambling laws and licenses and are completely safe for you to play at in 2025.

LIST OF 300% DEPOSIT BONUSES

At the moment, none of the casinos in our database offer a 300% deposit bonus. While our experts are sourcing the UK market for new 300% bonuses, we have compiled a list of the best alternatives that you can get.

BEST ALTERNATIVES TO A 300% DEPOSIT BONUS

BALLY CASINO

Get :
Play £10 Get 30 Free Spins on Secrets of the Phoenix Megaways (No Wagering Requirements)
18+. Min deposit £10. New players only.T&C's Apply and GambleAware #ad

Bally Casino Review

T&Cs Apply

New customers only

New members only, must opt in. Min £10 deposit & wager (excl. sports betting). 30 day expiry from deposit. 18+. Free Spins: on Double Bubble. 1p coin size, max lines. Game availability & restrictions apply. #AD GambleAware.org.

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MONOPOLY CASINO

Get:
Play £10 Get 30 Free Spins on Monopoly Paradise Mansion (No Wagering Requirements)
18+. Min deposit £10. New players only.T&C's Apply and GambleAware

Monopoly Casino Review

T&Cs Apply

#adNew customers only

18+. 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. Full T&Cs apply Terms Apply. GambleAware.org.

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RAINBOW RICHES CASINO

Get :
Play £10 Get 30 Free Spins on Rainbow Riches (No Wagering Requirements)
18+. Min deposit £10. New players only.T&C's Apply and GambleAware #ad

Rainbow Riches Casino Review

T&Cs Apply

New customers only

New members only, must opt in. Min £10 deposit & wager. 30 day expiry from deposit. 18+. Extra Spins: on Rainbow Riches. 1p coin size, max lines. Bingo: Advertised ticket value based on £1 tickets. Game availability & restrictions apply. **£10 lifetime deposit for Daily Free Game. #AD GambleAware.org.

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VIRGIN GAMES

Get :
Play £10 Get 30 Free Spins on Double Bubble (No Wagering Requirements)
18+. Min deposit £10. New players only.T&C's Apply and GambleAware #ad

Virgin Games Review

T&Cs Apply

New customers only

18+. New players only. One offer per player. Min Dep and wager £10. Spins value 1p. Free spins on: Double Bubble. Spins expire after 30 days. Terms Apply. GambleAware.org. #ad

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PLAYING WITH A 300% SLOTS DEPOSIT BONUS

Casinos usually offer players 100% deposit bonuses. Every now and again a casino will double this to 200% but it is extremely rare for an online casino to offer a 300% bonus.

We have sweeped the casino industry to bring to you the casinos that are currently offering a 300% deposit bonus.

Don’t forget, 300% bonuses will usually come with terms and conditions attached to them which we will detail below.

TERMS AND CONDITIONS OF 300% DEPOSIT BONUS

You should check the terms and conditions of all casino bonuses.

In our table of 300% deposit bonus casinos, we have detailed the terms and conditions for you.

WHY CHOOSE A 300% BONUS?

Gives you a huge starting bankroll of 4x your initial deposit.
Allows you to test lots of slots without risking too much of your own money and instead play with the casino’s bonus funds.

OTHER SIMILAR BONUSES

Also, don’t forget to check out our full list of slots bonuses.

CONTRIBUTORS

Greetings, I’m Jean Prince

Jean Prince, also known as ‘The Hawk’ in our newsroom is the editor in chief at SlotsHawk.com. He always keeps a hawk eye on the slots market and never lets anything important slip out of his sight.

Editor in Chief since 2020