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Rumble Ratz Megaways™ Review

Rumble Ratz Megaways™ Details

Software providerKalamba Games
Number of ways4,096 – 46,656
Reels Layout6x6
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The Middle Ages are not often the setting of choice for Megaways™ slots, yet in Kalamba Games’ Rumble Ratz Megaways™, we are transported into a medieval kitchen filled with hungry mice looking for cheese. And if we help them out before the cat gets them, we may be rewarded with instant cash prizes, extra spins, and Wild substitutions!

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What Is Rumble Ratz Megaways™?

Rumble Ratz Megaways™ is an upcoming video slot from Kalamba Games, set to be released on 17 August. It features a much-loved cat-and-mouse theme with a quirky and realistic design, reminiscent of the popular animated Disney movie, Ratatouille.

The developer has experimented with the Megaways™ mechanic in the past since partnering up with Australian software provider, Big Time Gaming. Their most recent Megaways™ slot is Machina Megaways™, which enjoyed notable commercial success.

Rumble Ratz Megaways™ may deliver a similarly memorable experience, as Kalamba Games is known for pushing the boundaries of the Megaways™ layout and enriching it with original elements, such as K-cash symbols and hyper bonuses. These extras and more will also be present in this launch.

We must further praise the developers for setting this game in the Middle Ages, a context that is not tackled often in online slots. The game invites us to follow the adventures of rodents as they race to find cheese and, of course, evade the neighbourhood cat in the process!

Join us for a detailed breakdown of the bonus features, RTP, and more in our Rumble Ratz Megaways™ slot review!

Rumble Ratz Megaways™ Key Facts

  • Bets: £/€/$0.25 – £/€/$37.50
  • Ways of winning: 46,656
  • Theme: Cat-And-Mouse, Medieval
  • Symbols: 9, 10, J, Q, K, A card suit symbols + Spatula Mouse, Ladle Mouse, Rolling-Pin Mouse, Honey Mouse, Golden-Spoon Mouse, Platter of Cheese
  • Wild: Golden Wild Symbol
  • Scatter: Pile of Cheese
  • Free Spins: Yes
  • Bonus Games: Yes
  • Devices: Smartphone, desktop, tablet

Rumble Ratz Megaways™ Features

Kalamba Games seems to stick to its strategy of deviating from the norm, despite building on a well-known Megaways™ engine, which is refreshing to see. The game has 3 bonus features in total, an overall decent amount.

Two features are relatively common for the genre, so you may instantly recognise them if you like to browse through our Megaways™ slots list: The Free Spins feature and the Bonus Buy feature (rebranded to HyperBonus here, but the principle remains the same).

A welcome change is the base game – we no longer have the Cascading Reels feature powering the action and leading to consecutive wins. Instead, there are blocker tiles on each reel, which players must unlock by landing K-Cash symbols.

Another pleasant addition is the default number of ways to win being set at 4,096. This gives players a nice head start and great odds compared to most other games, which begin at 64.

K-Cash Collection

Rumble Ratz Megaways™ clearly stands out from a regular Megaways™ slot in terms of base game creativity. Upon opening the game window, you’ll notice a set of blocker tiles in the shape of a grey stone wall, with a tiny mouse in the centre.

These tiles have no value. In order to remove them and get them replaced with profitable icons, you need to land a K-Cash symbol on each corresponding reel.

The K-Cash symbol is a platter of cheese. When one lands on a reel, the tile above will get removed. The K-cash symbol value will get added to the K-Cash metre, which stands above the main reels.

Moreover, if the column height is 6 when a K-cash symbol appears, the column will be reset to 4 rows, and you’ll receive an instant cash prize.

K-Cash symbols can be collected during both the base game and the free spins.

Free Spins

To trigger the free spins, you need to land a set number of Scatter symbols anywhere on the reels. This will also provide you with an instant-cash win but you’ll only be able to get 3 spins max, irrespective of the number of triggering scatters.

This is how it works:

  • 3 Scatter symbols = 3 spins + x2.5 your stake
  • 4 Scatter symbols = 3 spins + x6.25 your stake
  • 5 Scatter symbols = 3 spins + x12.5 your stake
  • 6 Scatter symbols = 3 spins + x18.75 your stake

At the start of the Free Spins feature, the reels will be set at 4 positions high. On the right-hand side of the screen, you’ll see the K-Cash Multipliers, which vary from x1 to x10 max. When you land K-Cash symbols, the values will again be added to the K-cash metre.

If the column is fewer than 6 rows high and a K-cash symbol lands on it, the column may randomly expand, and the free spins counter will reset to 3.


The HyperBonus feature is a standard buy pass, only under a different name. If you reside in an unrestricted jurisdiction, you can buy your way into the Free Spins feature for a fixed cost.

Here’s how:

  • x60 your stake – 3 free spins, with a x4 K-cash multiplier
  • x100.4 your stake – 3 free spins, with a x7 K-cash multiplier
  • x140.6 your stake – 3 free spins, with a x10 K-cash multiplier

Before the round starts, you’ll be asked to specify which option you want and be given a cash value. For example, if your initial stake is £/€/$2, the costs in real money will be £/€/$281.20, £/€/$200.80, and £/€/$120, respectively. Once you confirm, the feature will start immediately.

Do keep in mind that players at United Kingdom Megaways™ casinos are forbidden from playing bonus buy slots due to a regulatory requirement by the UK Gambling Commission.

Rumble Ratz Megaways™ RTP, Volatility & Win Potential

One characteristic of Megaways™ slots that the developer hasn’t strayed from when it comes to this launch is the high level of volatility. This can lead to large wins with low frequency, up to a top payout of x5,000.

In real-money terms, that means you can earn between £/€/$1,250 and £/€/$187,500, depending on your bet size.

The Rumble Ratz Megaways™ RTP score is estimated at 96.21%, but it can increase slightly if you use the HyperBonus feature.

Rumble Ratz Megaways™ Stakes & Betting Range

Rumble Ratz Megaways™ has a wide range of bets that accommodates most pockets. This starts at just 0.25p/c per spin and goes up to a maximum of £/€/$37.50.

Having said that, this game doesn’t quite make it onto our best low-stake Megaways™ slots list and may not really be enough for most high rollers.

Theme, Slot Design & User Experience

Did someone say mice chase? Kalamba Games invites us into a Medieval dining hall, which is invaded by mice scouring for cheese, much to the chagrin of the cat watching from the sidelines.

The interior design is authentic and superbly depicted by the developers, with a large fireplace illuminating the main reels alongside storage barrels, garlic, pumpkins, and wooden spoons.

The game doesn’t miss any detail in terms of graphics and visuals: from the lit candles in the background to the cheese, giving the room a lovely golden glow. The quirky animal characters move the story forward and will undoubtedly appeal to fans of the previously-mentioned animated blockbuster.

Meanwhile, the rhythmic medieval soundtrack in the background works perfectly with the theme, only occasionally interrupted by the sound of hungry mice and cats meowing.

Paytable & Special Symbols

The Rumble Ratz Megaways™ slot’s paytable is easy enough to understand. Let’s take a look at it together.

  • Playing cards 9, 10, J, Q, K and A – low-value symbols, pay between x2-x2.6 your stake for 6 of a kind
  • Different mice characters – pay between x3-x5 your stake for 6 of a kind
  • Pile of cheese – Scatter symbol, 3 of which will trigger the Free Spins feature and award you an instant cash prize
  • Golden Wild Logo – Wild symbol, substitutes all other symbols, aside from the Scatter and K-cash symbol, appears on reels 2-5 in the base game and reels 2-6 during the free spins
  • Cheese platter – the special K-cash symbol

How to Play Rumble Ratz Megaways™

Rumble Ratz Megaways™ is a video slot with 6 dynamic reels, each holding between 4 and 6 symbols. That means the starting configuration of ways to win is set at 4,096, with a maximum of 46,656. The reels will extend in height between 4 and 6 spaces, with a sort of elevator system in place that the cute rats manoeuvre.

To trigger a win, you must match at least 3 symbols on adjacent reels, starting from the leftmost one.

During our Rumble Ratz Megaways™ slot review, we discovered that the game uses an atypical payout system compared to a regular Megaways™ slot. Because there are no Win Reactions present, your goal is to remove the non-paying blocking tiles from the reels to reveal more symbols and increase the number of ways to win. This process will be sped up by landing K-Cash symbols.

When you open the game window, you’ll be able to quickly set your stake by clicking on the coin graphic element on the right side of the screen. Based on our first look, the game will also come with two additional spinning modes – Autoplay and Turbo Mode.

Rumble Ratz Megaways™ Pros & Cons

Should we participate in this cat-and-mouse race, or are we better off as onlookers? Here’s our honest breakdown:


  • Unique K-Cash Collection feature
  • Gorgeous visuals & sound effects
  • Wide betting range


  • Low maximum win
  • High volatility
  • Smaller-than-average number of ways to win

Rumble Ratz Megaways™ Review Final Say

Rumble Ratz Megaways™ is definitely one of the most original and playful takes on the Megaways™ genre. Kalamba Games took Big Time Gaming’s mechanic and improved it with some fantastic additions. The replacement of the standard Cascading Reels with the K-Cash collection system and the lovely animated characters make for a memorable experience.

Unfortunately, we’re slightly disappointed by the top payout of x5,000, which is below what the genre tends to offer (x10,000-x50,000). What’s more, the high volatility makes triggering big prizes a waiting game, and the paid options are rather pricey for the average player.

All in all, if you still have a soft spot for mice or the Middle Ages, this one will go straight to your heart!

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During our Rumble Ratz Megaways™ slot review, we discovered that the estimated RTP score is 96.21%. Lower RTP versions are also possible, so make sure you check out which version you’re playing beforehand.
Landing K-cash symbols in the base game and triggering the Free Spins feature can help you acquire more wins along the way. But do keep in mind that it’s a game of chance at the end of the day, so it all comes down to good fortune.
Rumble Ratz Megaways™ has not yet been released for real money. However, when it is, you’ll most likely find it at online casinos with content from Kalamba Games, such as Unibet, Casimba or Casumo.
Yes, if you activate the HyperBonus feature, you’ll play with different RTP scores, depending on the option you select: 96.21% RTP (level 1), 96.46% RTP (level 2) and 96.70% (level 3). Even so, these changes are unlikely to make an actual difference during your gameplay.
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Author Expert

Rhianna is a freelance writer who is passionate about travelling and writing engaging content. From Bali to London, she enjoys bringing a creative flair to her work, taking inspiration from her travelling experiences. When living in Malta, Rhianna was introduced to the world of iGaming. Since then, she has been committed to growing her career in the iGaming industry, by delivering informative and engaging articles to gaming enthusiasts.


ticksEditor since: 2023
ticksTotal posts: 126
ticksLanguages: English


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