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400% Casino Bonus – How To Quadruple Your Bankroll in 2024

The more lucrative casino bonuses are, the rarer they’ll be. Once you’ve found a 400% casino bonus, you'll need to know the ins and outs involved. That's where we come in with this guide that's part of our best online casino bonuses series.

The Best 400% Casino Bonus

1 Comix Casino
Regulated by
Payment Methods
  • Minimum deposit of €10
  • 50x wagering requirement
  • Bonus valid for 30 days
400% Up To €80 (Crazy Bonus)
2 Bet4Joy
Regulated by
Payment Methods
  • Minimum deposit of €10
  • 50x wagering requirement
  • Bonus valid for 30 days
400% Up To €80 (Crazy Bonus)
3 BetRocker
Regulated by
Payment Methods
  • Minimum deposit of €10
  • 40x wagering requirement
  • Bonus valid for 30 days
400% + 50 Free Spins
4 Lucky Red Casino
Regulated by
Payment Methods
  • Minimum deposit of $10
  • 50x wagering requirement
  • Use code "LUCKYRED400" to activate bonus
400% Up To $4,000
5 PlayDingo
Regulated by
Payment Methods
  • Minimum deposit of €10
  • 50x wagering requirement
  • Bonus valid for 30 days
400% Up To €80

Top Online Gambling Sites That Offer a 400% Casino Bonus in 2024

Although a 400% casino bonus is not a common occurrence, it’s also not rarer than a unicorn, we promise! In fact, with the proper set of information and tools at hand, you can track and redeem some highly rewarding options, with clear-cut terms and conditions. Here are three of the best 400% casino bonuses worth checking out.

#1 Comix Casino

Comix Casino gets new players through the door with a bang. That’s right, a mere €/$10 deposit will unlock a substantial 400% slots bonus up to €/$80. To get it, you must opt-in to the offer at registration or after, from the bonus page, and make your deposit using any of the approved methods. A 50x wagering requirement applies to the bonus funds.

The offer is available for 30 days after activation, and the maximum bet you can place with an active bonus is €/$5 or currency equivalent. Do keep in mind that the bonus can only be wagered on bonus games, which you can find using the search filters in the casino section. For more details, look over the full terms & conditions of this welcome bonus.

Aside from the sign-up promo, you can also claim other evergreen and seasonal offers, for example a 24/7 live casino 10% cashback bonus, weekly slots tournaments with €3,000 cash prizes, referral bonuses, and loyalty rewards. The latter are granted in the form of coins that can be exchanged for cash.

The site is owned by Winzon Group LTD, and operated legally under a valid licence from MGA (Malta Gaming Authority), licence number MGA/B2C/717/2019. Players will benefit from fair games and odds to win, as the content is verified independently and approved by iTech Labs.

Thousands of games await a lucky spin in the casino library, for example, video slots, card games, table games, video poker, arcade games, jackpot slots, and Megaways™ slots. The platform has also created a few slot collections based on theme, with creative names like Ho-Ho-Ho and Valentine Spins. Among the software providers, we’ve only found leading names like NetEnt, 1×2 Gaming, BGaming, and Betsoft.

To cater to its main audiences, the site supports payments through several localised options, such as POLi, Trustly, Interac, and MuchBetter.

Comix Casino mobile

Comix Casino on mobile. (Source: Comix Casino)

Play at Comix Casino

#2 Bet4Joy

Our next choice for you is Bet4Joy, showcasing a similar slots welcome bonus of 400% up to $80. To activate it, you must select this bonus and make a minimum deposit of $10. The bonus funds have a 50x wagering requirement before they can be withdrawn as real money. The wagering must be fulfilled on any of the bonus game slots. Furthermore, there are two other bonus options available at registration, namely a standard bonus and a high-roller bonus. For more information on each, check out the full terms & conditions of the welcome package.

The platform displays a growing library of 1,000+ premium casino games from 40+ established studios like Push Gaming, Relax Gaming, Spinomenal, and EGT. These are carefully organised into categories based on common player interests, for example ‘new releases’ and ‘top’. Whether you prefer slots, table games, or video poker, you can experience the latest hit titles for fun or for real money, and truly Bet4Joy!

You’ll be playing in a fully regulated environment, as the site is licensed and authorised to offer type 1 gaming services by the MGA (Malta Gaming Authority), licence number MGA/B2C/717/2019.

Bet4Joy Casino mobile

Bet4Joy Casino on mobile. (Source: Bet4Joy)

Play at Bet4Joy Casino

#3 Bet Rocker

Have you always dreamed of rocking out on stage, with concert lights and guitar riffs blasting in the background? Well, now you can rock the reels with an outstanding 400% welcome bonus of up to $80. Cleverly dubbed a ‘crazy bonus’, especially on a small deposit of just $10, it’s available once to any newly registered user. The bonus funds must be wagered 50x times.

Alternatively, if you’re ready to deposit more, for example $20 or $50, two additional sign-up offers are available:the popular choice, which is 200% up to $100, or the VIP bonus, which is 100% up to $500. These last two options have lower wagering requirements of 40x and 30x, respectively. Can’t make up your mind? Read the full terms & conditions to learn more about the welcome package.

With your favorite bonus secured and ready to play, you can explore an abundance of premium video slots, RNG games, arcade games, and live casino titles. There are some handy filters on display to help you track games by release date, most played, game title, or software provider.

Some trending titles that caught our eye and will certainly warrant a few spins are Jammin’ Jars, Bison Battle, and Razor Shark, released by Push Gaming. But you can further enjoy fresh content from other studios like Fantasma Games, Microgaming, and Endorphina.

The site operates under an MGA licence (MGA/B2C/717/2019), making it as safe as possible. Moreover, getting funds in and out of your account is a breeze. The site supports deposits and withdrawals using online banking (e.g. Trustly, Interac), debit cards (VISA, Mastercard), pre-paid methods (paysafecard, Neosurf), and various e-wallets (Skrill, MuchBetter, NETELLER).

Bet Rocker casino Mobile

Bet Rocker casino on mobile. (Source: Bet Rocker)

Play at Bet Rocker Casino

What Is a 400% Casino Bonus?

This kind of bonus is a reward or incentive often offered to new players on their first deposit/s to a gambling platform.

It is usually provided as a fixed percentage of bonus money on top of the player’s initial deposit, up to a maximum threshold set forth by the casino (e.g. 400% bonus up to €100).

This offer can also consist of free spins – in this case, the players only need to make a minimum qualifying deposit, for example, €10. Then, they’ll receive between 25 and 500 extra rounds at a particular online slot (e.g.: Starburst, Book of Dead, or Wolf Gold).

How Do 400% Casino Bonuses Work?

The main principle is easy to understand – players receive four times their initial investment, whether that’s in bonus money, free spins or other benefits, such as loyalty points.

A 400% casino bonus is rare to find and one of the most competitive offers on the market. That is precisely why, when you do come across it, you need to carefully read the terms & conditions.

It’s exceedingly rare to find this kind of bonus awarded with no deposit – usually, that can also be considered a red flag. Shady platforms can sometimes offer very generous offers like this to attract newcomers.

Not only that, but reputable online casinos with valid licences will usually require a real-money deposit upfront to grant you a 400% bonus.

Who Can Claim a 400% Casino Bonus?

In the vast majority of cases, a this casino bonus is an offer aimed at new players to thank them for signing up after following the below steps:

  1. Register.
  2. Pass all relevant verification checks.
  3. Deposit through a method and/or use casino promo codes to unlock the offer.

However, you may also be able to claim the offer as an existing player, especially if you are a member of the casino's VIP club or loyalty programme.

Because of that, you may have to meet other requirements first, such as having VIP status, a high level of activity on the platform, or reaching a particular tier in the VIP scheme.

Types of 400% Casino Bonuses

When you browse through different gambling platforms, you’ll quickly notice that each structures and promotes their offers in a unique manner.

Depending on the casino’s policy, the bonus may include distinct benefits and steps needed to claim it. Some operators can add extra spins, poker chips, or a cashback bonus on top.

To make your journey easier, we’ve compiled the research for you. Here are the best 400% casino bonus offers you can find in 2024:

400% First Deposit Bonus

This is the most straightforward example of this type of offer – to claim it, you only need to make a first deposit, typically the minimum amount set by that particular casino.

For Example: For Example:

Let’s take Playdingo’s current offer as an example to make this even easier to understand. This site advertises a 400% bonus up to €80, with a minimum deposit of €10 to claim.

If the player makes the minimum deposit only, the casino will match it by 400%. So, after you deposit €10, you will have €50 as play money. However, online casinos will also set wagering requirements for the bonus money, the deposit, or both.

Keeping Playdingo’s example in mind, here, the operator asks us to wager both the deposit and the bonus funds 50x. Don’t forget this golden rule: the higher the wagering terms, the less attractive the offer.

(Source: PlayDingo)

Welcome Packages

There may be instances where the 400% casino bonus is part of a larger welcome package that includes other offers. For example, let’s take Casino Superlines’ current promotion.

Good to know: Good to know:

The operator offers a 400% casino bonus on your first deposit. However, they will also match your second deposit by 100% and your third deposit by 200%. This will essentially create a welcome package with a whopping 700% bonus!

However, other platforms will structure the bonus differently, with all percentages offered on the player’s consecutive deposits cumulatively reaching 400%.

In this case, the bonus structure may look a little something like this:

  • 100% on your first deposit up to €300
  • 200% on your deposit up to €100
  • 100% on your third deposit up to €50

Free Spins

When you claim a 400% casino bonus with free spins, two situations are usually possible – either the extra spins are included on top of the 400% welcome bonus, or the bonus consists entirely of free spins.

In the first scenario, you should expect a smaller number of free spins up for grabs, as they are seen as an extra to the main course – the offer may be worded something like “400% casino bonus on your first deposit + 25 extra spins at Book of Dead.”

However, in the second scenario, free spins will be the star of the show, meaning you can expect to unlock at least 100 rounds at your favourite video slot!

NetBet is a great example to note here – this online casino offers a welcome package consisting of up to 500 free spins when depositing £10 and using a promotional code.

400% Match Deposit Bonuses With Promo Codes

Unlocking a 400% bonus at an online casino can also include an extra step, which involves inserting a promo code in a designated field (also known as bonus code, coupon code or voucher).

Both Lucky Red Casino and 4 Crowns Casino serve as fantastic examples here  – they will match your initial deposit by 400% if you use dedicated promo codes either at registration or in the “cashier” section.

Do keep in mind that promotional codes need to be inserted correctly down to the last letter or the offer won’t be credited – the instructions should be presented in great detail on the offer page or in the terms & conditions.

Promo codes usually consist of generic words, such as ”WELCOME1” or include the brand name (e.g.: ”LuckyRed400”).

Casino Bonus for High Rollers

Some online casinos advertise bonuses for regular players, but they also reserve a special category for high rollers. The only real difference is that 400% casino bonuses for high rollers usually require a higher minimum deposit. Naturally, the reward potential is equally attractive.

Whilst in some cases it may be enough to deposit a larger initial sum as a newcomer, in others, you may need to be enrolled in the loyalty programme first to access the offer, or be a VIP customer.

Where Can I Find 400% Casino Bonuses?

The rule of thumb to go straight to the source. We’ve selected a list of trustworthy online casinos with this offer in our table above, so you can use it as a great place to start!

Other means of communication that online casinos use to advertise their offers are social media, real-money gambling apps, newsletters and even YouTube!

If you want to be the first to find out about new, juicy deals, we highly recommend following all of the above channels and, of course, turning on your notifications!

Casino Bonus Terms & Conditions, Explained

The large majority of casino promotions, no matter how lucrative they seem upon first glance, will come with some strings attached. Therefore, a 400% casino bonus claiming to have no wagering or no deposit requirements is usually a massive red flag.

Reputable online casinos will have explicit terms & conditions that limit the overuse of a particular bonus. It’s important to carefully read each of them to best determine if the offer is worth claiming, and if the terms are fair and transparent, as they should be:

Minimum Deposit

This requirement refers to the minimum amount of money you need to deposit upfront to be eligible for a 400% casino bonus. Based on our research, this amount is small – €10 or €20 on average.

Eligible Payment Methods

Some online casinos restrict particular payment providers from welcome bonuses in general, and that may also apply to a 400% casino bonus.

Usually, e-wallet deposits are the ones excluded. So, if you tend to visit Skrill casinos, NETELLER casinos or PayPal casinos a lot, you may miss out on the offer if you don’t look for an alternative deposit method.

Thankfully, the eligible payment methods are mentioned in plain sight on the bonus page, so make sure you read the fine print!

Wagering Terms

The wagering or rollover terms refer to the amount of times you need to play through the bonus funds before you are able to convert them to real money.

When you claim a 400% casino bonus, the terms & conditions will explicitly mention if the wagering terms apply to your initial deposit and the bonus funds, or only one of the two.

A sweet spot to look for is 25x or 30x as maximum wagering terms – the higher you go, the harder it’ll be to convert the bonus balance into withdrawable cash. Here’s how it all works in practice:

Wagering Requirements
  • Wager £50 – Wagering Rate 20x = Total you need to wager = £1,000
  • Wager £100 – Wagering Rate 35x = Total you need to wager = £3,500
  • Wager £200 – Wagering Rate 5x = Total you need to wager = £1,000

Withdrawal Limits

Gambling sites may also limit the amount you can win with the 400% casino bonus. Similar restrictions can be placed on the free spins, if they’re included in the overall package.

For example, if you’ve deposited $100 and the online casino matches it by 400%, you’ll have $500 in play money. However, anything you win above the maximum threshold specified by the casino can’t be withdrawn.

There is some good news, as well – some operators, such as Lucky Red Casino, don’t have any maximum cashout limits set.

Time Restrictions

Almost all gambling promotions have a limited time frame in which they can be claimed – this also tends to be the case with a 400% bonus.

In practice, that means you will have to claim the bonus and fulfil all wagering terms within a certain time window; otherwise, the operator will cancel the bonus and all winnings acquired with it.

When it comes to a casino bonus, the time window is pretty broad – between 7-14 days on average or even 30 days. If the rollover requirements are fair, you should have plenty of time to meet those demands.

Games & Stake Restrictions

Before you get too excited about that 400% casino bonus with free spins, you should know that gambling operators often limit the bet amounts you can use.

The same unfortunately applies to the selection of games you can use your bonus on – make sure you also consider this, so you don’t get stuck playing a game you don’t like!

Often times, free spins are only available at a particular online slot, and you’ll only be able to play with the minimum stake (e.g. €0.01 – €0.02 per spin). This may not be a huge problem for a low-stakes gambler, but high rollers will surely think differently.

How To Claim a 400% Casino Bonus – Your Easy Guide

To claim a 400% bonus, the steps you need to follow will always depend on the operator’s policy.

However, usually, the procedure is very similar, with only a few minor differences. Here’s how to claim a casino bonus in just 6 steps – grab your laptop or phone, and let’s begin:

  1. Choose an online casino with this offer (look over our table above for inspiration!)
  2. Register a new account.
  3. Upload copies of your documents to verify your identity.
  4. Make the minimum deposit through the method required.
  5. Insert a promo code at registration or in the cashier (optional).
  6. Grab & enjoy your 400% casino bonus!

Any wins acquired with the bonus will be credited into your bonus balance, which is separate from your real-money balance. Make sure to meet any wagering terms attached before you can request a withdrawal in cash.

Carefully weigh all restrictions that apply before proceeding, and avoid offers with narrow time windows!

How We Choose Casinos Offering a 400% Bonus

Never choose an online casino for the long-term based on a single promotion.

There are other factors at play that matter just as much, perhaps even more, from the security of the platform you’re gambling on, to its reputation and bonus terms.

You can be drawn in by a substantial bonus amount and lose sight of the other factors. Here’s what to look at to protect yourself and your personal data before choosing the absolute best casino with a 400% bonus:

What to look out for:

The risks associated with playing on unlicensed platforms are enormous. There’s literally no player protection in sight, nor any central authority you can contact if you were scammed and no safety procedures in place.

Because of that, this is the most important aspect you need to check before registering – visit the footer section of your online casino of choice. You will find all licensing information you’re looking for, from the issuer to the availability, licence type and number.

We only select 400% bonus casinos licensed by prestigious authorities, such as MGA (Malta Gaming Authority), Curaçao eGaming or Gibraltar Gaming Commission.

Lastly, we carefully review their safety protocols (firewalls, SSL certificates, data confidentiality agreements), so that any personal information you share with the platform is not at risk.

Bonus terms should always be specified in great detail, in a transparent section of the page. This way, the player can consider every aspect in order to make an informed decision.

You should not have to jump through hoops to find the key information you are looking for – any legitimate online casino will have a dedicated terms & conditions section, as well as in-depth information, directly on the promotional page.

Moreover, bonus terms should be reasonable and attainable for the average gambler – if you see a 400% casino bonus with a 70x rollover requirement, and a time limit of 24 hours, simply walk away. Such offers are designed to put you at a disadvantage.

If you run into any issues when registering a new account or trying to claim your bonus, it’s essential to know you can contact someone instantly and receive assistance.

The operators we select have impeccable customer support services via live chat 24/7, telephone or email. Even if you contact the online casino in writing, you should aim for a good response rate of 24-48 hours.

This is yet another proof that the platform in question values its customers and resolves issues in a timely manner.

If you want to accurately gauge the reputation of a casino offering a 400% bonus, you can start by browsing through player forums and communities, then assess what the main positives and negatives are.

However, if you see many player complaints that are centred around the same issue, it’s definitely an aspect you shouldn’t ignore.

To go one step further, you can look up your online casino of choice on the regulator’s official database – if they were blacklisted in the past, that’s the biggest red flag!

A trustworthy casino will display software stamps of approval from eCOGRA or iTech Labs.

This will give you more peace of mind when gambling, as this means that each game on the platform uses RNG technology (Random Number Generator), so your odds are fair.

Another certificate of trust is the online casino’s list of software providers – if you see games by Microgaming, iSoftBet or Playtech listed, that’s a fantastic sign, since these are some of the most well-known studios in the industry.

Pros and Cons of the 400% Casino Bonus

Here’s an overview of the advantages and disadvantages to expect before you grab this offer with both hands:


  • Quadruples your starting bankroll
  • Requires a small minimum deposit
  • Often includes other bonuses on top (free spins, cashback)
  • You get to test out different casino games
  • Attractive to both low rollers and high rollers
  • Can be claimed by newcomers


  • Some have very high wagering requirements
  • Hard to find for UK-based players
  • Low maximum cashout limits often attached

Why Do Casinos Offer 400% Bonuses?

You may be wondering, and rightfully so – what’s the catch? Why would an online casino offer such a generous bonus amount to a new player, or even a loyal customer?


Well, the answer is simple – iGaming is one of the most competitive industries out there. Many gambling sites are chasing new players for business, so it’s no surprise the incentives and bonuses offered are constantly rising in monetary value.

A 400% casino bonus is also a great marketing and retention tool – if it comes with fair wagering terms, it instantly establishes trust for a new gambler. Moreover, it boosts that platform’s popularity and reputation.

Lastly, a new customer is more likely to stick to a gambling site that welcomed them so generously. Evidently, online casinos are betting (no pun intended) that it’s exactly what will happen!

Taking all the above into consideration, everybody wins – the player also receives a help to increase possible winnings and their bankroll gets a significant boost, which will lengthen and enhance playing time.

The Mathematics Behind the Bonus
  • Wager £10 – 400% Bonus = £40
    Total bankroll =£50
  • Wager £20 – 400% Bonus = £80
    Total bankroll = £100
  • Wager £30 – 400% Bonus = £120
    Total bankroll = £150
  • Wager £50 – 400% Bonus = £200
    Total bankroll = £250

Alternatives To the 400% Casino Bonus

If you can’t find this offer in your region or jurisdiction, don’t fret too much – top casino sites will always provide alternative offers to get you through the door with a smile, such as:

Which is the best alternative for you?

A match bonus is one of the best online casino welcome bonuses out there and, thankfully, it's one most online casinos have listed on their platforms. The principle is simple – once you register a new account and make a first deposit, the operator will double the amount. The most common types of such bonuses are the 100% deposit bonus and the 200% casino bonus.

If you deposited €20, you’ll have €40 in play money. However, restrictions often apply and your funds will only be matched to a certain maximum amount – e.g. 100% up to €100.

A 300% casino bonus can be credited in different ways: for example, you can get a 300% match deposit bonus when you fund your account for the first time. So if you deposit €40, the online casino will reward you with €120.

However, a 300% bonus can also be credited in incremental or offered as a welcome package. For instance, you can receive a 200% match deposit bonus when you first top up your balance, a 75% reload bonus on your second deposit and a 25% bonus on your third deposit.

A 500% casino bonus is terrific, especially for a new gambler! It is, without a doubt, one of the rarest offers out there and, unfortunately, it tends to come with high wagering terms.

Our advice is to evaluate the rollover requirements even more carefully with a big bonus like this – make sure it looks just as good in practice as it does on paper!

For example, if you deposit €10, and grab a 500% casino bonus, you’ll have a total of €60. However, if the wagering requirements are above 50x, it will be very hard to make the qualifying bets and clear the bonus.

600% casino bonuses are quasi-mythical in the gambling world, in that they are so hard to find that some just go for the lower percentage offers just cause they're easier to find. Once you've caught one of these mythical creatures, you can expect to increase your deposit 6 times over! Look out for those massive wagering requirements though!

Can UK Players Claim a 400% Casino Bonus?

Unfortunately, very few UK casino sites offer a 400% bonus. Instead, this offer is more common at EU casinos or offshore licensed gambling platforms. With that said, we’ve found two happy exceptions:

888 Ladies has a similar promotion – if you register and deposit £10, you get £50 that you can use on both bingo and slots.

In general, when it comes to the UK market, these high casino bonuses are more frequently encountered on bingo sites, rather than slot sites.

400% Casino Bonus – Summary

A 400% casino bonus is one of the most attractive and versatile offers, as it can be claimed by both new and existing players, if they follow the right steps.

Although it is rare to find and comes with several restrictions, if you follow our detailed guide, you can certainly make the most of it!

400% Casino Bonus FAQs

A 400% casino bonus is a monetary reward typically offered to new players as a welcome offer. Your initial deposit will be matched by 400%, so you quadruple your bankroll!

You need to sign-up to an online casino that provides this offer, complete the verification checks, then top-up your balance with the minimum deposit required for the bonus. Alternatively, you may need to deposit through a particular method or use a promo code.

Although it’s a rare offer, you can still find 400% casino bonuses on many licensed gambling platforms, such as Lucky Red Casino or Playdingo.

Yes, absolutely. Most 400% casino bonus offers are aimed at new players in particular, so you have plenty of choices!

It depends on the offer and the operator’s policy. Sometimes e-wallet deposits via Skrill and NETELLER are excluded from all welcome offers, including a 400% casino bonus.

Of course, unless specified otherwise. Mobile gambling is currently on the rise, so many of these awesome rewards can be claimed on a smartphone or tablet as well!

No. Doing this is against the terms & conditions and could result in your account getting deactivated. You can only claim a 400% casino bonus once per account/IP address.

Yes – but only if the bonus terms are fair, the time window is not too restrictive and the rollover requirements are reasonable, so you can make the best of it. A 400% casino bonus not only quadruples your play money, but you also get to experience more games with the same investment, such as video poker, jackpot slots or roulette.

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Ramona D

Ramona D

Author Expert

Ramona Depares is an award-winning journalist focused on cultural and entertainment-related content. Based in the Mediterranean iGaming hub of Malta, she has taken a deep interest in gambling-related news since the earliest days and has witnessed the global landscape evolve. Ramona specialises in the legal and regulatory aspects of gaming across multiple jurisdictions. She also has a specific interest in skill-based games, particularly live dealer casino variants.


ticksEditor since: 2019
ticksTotal posts: 269
ticksLanguages: English


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