Book of Monsters Slot

Book of Monsters Slot RTP, Details & Wager Limits

Opening up the Book of Monsters slot game by Pragmatic Play, you’ll find a 7×7 grid running on a cluster pays system, like a lot of new online slots. To land a win, you need at least 5 matching symbols adjacent to one another and connected either vertically or horizontally.

Just like in other Pragmatic Play slots, the + and – icons let you pull up the full bet configuration settings. From there, you can adjust the wager level from 1 to 10, set the coin value between 0.01 and 1.20, and with the 20x bet multiplier, your total stake will range accordingly from 20p to £240. That’s a pretty decent spread for high rollers compared to a lot of other online slots.

If you’re playing in non-UK Book of Monsters casinos, use the Autoplay feature to let the slot run anywhere from 10 to 1,000 spins. And in the same menu, you’ll also find options to enable turbo spin, quick spin, or skip screens.

When it comes to the Book of Monsters RTP, it sits at 96.5%, a bit above the industry average you’ll see in most titles on top slot sites. I experienced some pretty wild swings, even when trying out the Book of Monsters demo in our library of free slots. However, it wasn’t that surprising considering the game’s highly volatile rating.

The Book of Monsters max win is 5,000x, just like you’ll see from the paytable itself. Therefore, you can expect to hit that by landing a 49-of-a-kind winning cluster of the red monster symbol (more on that later). Hunting for bigger wins? Check out the following online progressive slots.

Book of Monsters Theme—A Monster-Infested Hideout, but Make It Cute

I’d say the backdrop of the Book of Monsters base game feels like a cross between a mad monster lab and a haunted cave, with glowing eyes staring at you from the dark. The colour palette is made up of eerie blues and purples, but it’s the animations that bring everything to life. These include the little details like the spider dangling near the reels and the mist rising from the stone cauldron.

However, there’s not much horror here, even though it qualifies as a proper Halloween slot. The monsters are adorable, and their beautifully rendered hideout is more mysterious than sinister.

I’ve really taken a liking to the sound design, too. It’s a lot less spooky than I expected and has a much more playful feel.

The list of symbols might not be the longest, but the prize scale is impressive! The paying symbols include card royals as the lower-value ones, which is pretty standard in most of the best real money slots. Then, you’ve got 3 high-paying monsters in purple, green, and red. There aren’t any wilds, but during the base game, you might see randomly triggered giant symbols in sizes ranging from 3×3 up to 7×7.

Here’s a breakdown of all the symbols and their payouts:

Symbol	Payouts/Info
J	5 to 49+ = 0.2 to 100x stake
Q	5 to 49+ = 0.25 to 125x stake
K	5 to 49+ = 0.3 to 150x stake
A	5 to 49+ = 0.4 to 200x stake
Purple Monster	5 to 49+ = 0.5 to 250x stake
Green Monster	5 to 49+ = 1 to 500x stake
Red Monster	5 to 49+ = 2 to 5,000x stake
Scatter	3 to 7+ = 2 to 100x stake; 4+ trigger free spins

Book of Monsters Mobile Slot

Even with Book of Monsters running on a large grid, you won’t feel lost playing it at mobile casinos. Portrait mode on a smartphone usually means tight spaces, but the studio managed it exceptionally well. All that’s important fits neatly without feeling cramped or cluttered. The reels are actually enlarged and sit at the top, while everything else is placed neatly below.

Flip it to landscape, and it looks more like the desktop version, except the spin button is tucked on the far right, with the bet menu and autoplay settings on the left. It helps keep the control within easy thumb access. That said, if you’re left-handed or simply not a fan of the spin button placement, you can just turn off the spin button lock in the settings and move it wherever.

One thing I definitely recommend when playing on the go is switching on Battery Saver in the settings. It cuts down animation speed to help with power usage.

Book of Monsters Bonus Features

Technically, there is just one bonus feature in the Book of Monsters slot. However, it is quite full of special game mechanics that make up for the lack of diversity.

Free Spins

Landing 4, 5, 6, or 7 bonus symbols gets you 5, 6, 7, or 8 free spins, respectively. Before the round starts, the game randomly picks one paying symbol to act as the FAT symbol.

Also, before you start spinning, you have a chance to collect or gamble. However, with the latter, you have an opportunity to either upgrade the FAT symbol to a higher-value one or increase the number of free spins up to 8. A book flips its pages to reveal either an upgrade or the end. If you land a better symbol or more spins, you keep going. However, if The End appears, the gamble is lost.

Once the round begins, a 1×1 FAT symbol always appears somewhere on the grid, shifting to a different spot with every spin. Every time you land more of the same symbol (as long as they don’t overlap with the FAT one), they get collected in a meter. Then, once you reach certain thresholds, the FAT symbol grows in size:

• Collect 30 → Grows to 2×2
• +27 more → Expands to 3×3
• +24 more → Becomes 4×4
• +20 more → Grows to 5×5
• +16 more → Expands to 6×6
• +12 more → Maxes out at 7×7

Also, every time the FAT symbol levels up, the game randomly awards 1, 2, or 3 extra spins.

Ante Bet & Buy Bonus (Not Available at UK Online Casinos)

Turning on the Ante Bet feature increases your chances of triggering the Free Spins round. In fact, with the 40x bet, you’d only need 3 bonus symbols instead of 4 to activate the feature, and this makes it 7x easier to land the bonus round naturally.

Otherwise, you can instantly trigger the Free Spins round by buying it for 100x your total bet.

Book of Monsters Slot Verdict: A Monster-Themed Cluster Slot Built Around One Main Feature

4/5

Based on our expert’s review. Reviewed by Charlon Muscat

Charlon Muscat

Play Book of Monsters

Book of Monsters Slot

You won’t find a ton of bonus feature variety in the Book of Monsters slot, but it makes the most of what’s available, especially with the progressive free spins. There are no wilds here, and the gamble feature can be a bit of a risk, but those high-paying clusters and FAT symbol upgrades were more than enough to get me spinning.

Pros

• Progressive FAT symbol mechanic
• Gamble feature for free spins and symbols
• Cluster pays with huge win potential
• Strong mobile optimisation

Cons

• No wilds
• Technically, just one bonus feature available

I wasn’t sure what to expect at first from this slot game. However, the cartoon-style monsters and glowing cave setup immediately gave off lighthearted vibes. As for the gameplay, there aren’t loads of bonus features to go on about, but the free spins pack in more than you’d expect. In fact, the FAT symbol mechanic is one of the better progressive features I’ve encountered lately.

The gamble feature can be rough if you get that The End page, but there’s something really satisfying about pushing your luck and potentially watching that FAT symbol get more lucrative. Also, the 5,000x win cap, which you can also hit by landing a full 7×7 cluster of the top-paying symbol, is a solid target to chase. Try your luck in the demo and see how far you can push this cute little slot.