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If you’re looking for a huge casino bonus then you’ve come to the right place. With literally hundreds of casino bonuses to choose between, the Professor thought he’d make it easier for those on the hunt for a big bonus by collecting all of them in one place.

But what constitutes a huge casino bonus in his book? On this page, you will only find deals that start from 200% or £200 to guarantee a sizeable boost. However, some will go much further than this – skyrocketing to £300, £400 or even £500! Let’s take you through them – or you can head straight to your preferred choice.

200 Casino Bonus – Percent & Pounds (£)

The most common huge casino bonus in the Professor’s mind is 200. This can either be a percentage or the maximum cap of extra funds – with both options catered for. Of course, they’re not the biggest packages ever seen – but they will give you more than others.

200 Percent

Dunder Casino
No Deposit Bonus
20 Bonus Spins
First Deposit Bonus
100% up to € / £100 + 100 Spins
Play now20 bonus spins in Book of Dead. No deposit required. No deposit bonus spins expire 7 days after sign up. Wagering requirement 30x on bonus spins and 60x on 1st dep bonus. 18+ only. Terms and conditions apply.

We’ll start with 200% first, and there are several top UK casino sites lining up to triple your first payment. Yep, rather than simply double, whatever you decide will be multiplied by 3 up to a certain cap.

This means you can make smaller deposits to get the same amount of overall funds as you would from a standard 100-150% offer. Just make sure to calculate your wagering requirements!

£200 Deposit Bonus

No Deposit Bonus
EXCL: €/£5.55 Cash
First Deposit Bonus
100% up to €/£200 + 200 FS
Play nowNo deposit bonus must be claimed by contacting bonus department using either "£5.55" or "€5.55" as the subject line and will be credited within 24 hours. Must register as a new casino customer using the special link or banner provided. No deposit Wag. Req: 50x and must be used in 3 days. Austria, Finland, Germany, Iceland, Luxembourg, Norway, Russia, Hungary and UK eligible countries only. Game restrictions apply. Over the first 4 deposits, Wag Req: 35x, min deposit: £10, Max Bonus: £200 (100%) / £200 (50%) / £500 (25%) / £100 (100%). Max LV Spins: 200+200+500+100. LV Spins max bet: £5 until Wag Req is met.T&Cs

The alternative is a £200 slots bonus which gives you the additional funds to spin your favourite games with.

To be honest, narrowing this down to just one was difficult for the Prof, as there are a host of other £200 packages. He decided to go with Videoslots – but for more options, you can view all our casino sites and use the tools provided to filter to £200 offers.

300 Deposit Bonus (£)

No Deposit Bonus
30 Free Spins (No Wagering - UK!)
First Deposit Bonus
100% up to € / £300
Play now*18+. New UK customers only. Opt-in required. 30 free spins on Book of Dead game upon registration with NO wagering requirements or deposit required for spins AND 100% deposit bonus up to £300: Min deposit £10 and 30x wagering requirements apply on bonus (game weighting applies). Max bet applies. T’s and c’s apply. Please gamble responsibly, www.begambleaware.orgT&Cs

Yet, there was no such dilemma about £300 – with Casumo happily filling the void. This adventure-themed platform is one of the Professor’s all-time favourites – with Casumo even making it into the old timer’s top 20 online casinos UK. Some feat!

Truth be told, there are very few sites that can even warrant being mentioned alongside Casumo due to their class. And guess what!? They even have free spins without the need to deposit to get you started before the 300 deposit bonus for the UK kicks in…

400 Casino Bonus UK

Wink Slots
No Deposit Bonus
30 Free Spins
First Deposit Bonus
EXCL: 100% up to £400 + 50 FS
Play nowNew players only. Register & get up to 30 Free Spins [FS]. 10 FS per day, must be claimed by 23:59 on day of grant & valid for 7 days. FS wins granted in bonus after all used. FS wins set at £1–£4 (per 10 FS). Reg bonus wins capped at £100 exc. jp. wins. 1st deposit min £20 with code, 100% Bonus (max £400) + 50 FS on Kingdom of Cash. FS deposit wins set at £1-£13. Bonus wins capped at £400, exc. jp win. To withdraw, wager 30x the bonus funds. Wagering varies by game. Deposits can be withdrawn at any time. Withdrawal restrictions & full T&C's apply.T&Cs

The shackles are completely off with this one, as you can boost your coffers significantly for more slots and games entertainment.

Of course, you always need to keep an eye out for the percentage – as 25% up to £400, for example, could be particularly costly. However, the Professor’s chosen £400 promotion for UK players is matched 100% – and it also happens to be another of his exclusive casino promotions

£500 First Deposit Bonus

Slotty Vegas
No Deposit Bonus
First Deposit Bonus
EXCL: 100% up to € / £500 + 50 FS
Play nowNew players only. Bonus is over first four deposits. Up to a maximum overall bonus of £500 across the four deposits will be awarded. Wagering of x40 the bonus amount applies. Wagering must be complete within 7 days. Game weighting and eligibility varies. Free spins are valid for 7 days. Wagering of x35 for free spins applies. Players must wager their deposit at least 3 times before making a withdrawal using free spins winnings. Max bet is 10% of bonus amount, up to £5, for all bonuses.T&Cs

Incredibly, there are also a few sites that offer a crazily huge casino bonus of up to £500!

Please note, this offer is particularly rare, with only a handful of platforms willing to offer so much. Fun Casino is one of them – okay it’s not quite £500, but at £499 it’s basically the same. What’s more, you get two of them!

Casino Professor

Casino Professor

Casino Professor, or just Prof among friends, is an older guy with a knack on online casinos. Among gracefully ageing reviewing online casinos has become his life mission.