Tome of Madness Slot Review

Technical Table Information

RTP (return to player):96.59%
Casino Gaming Developer:Play’n Go
Release Date:27th June 2019
Maximum Multiplier:2000x
Winning Lines:Cluster Pays
Min bet: 0.10
Max bet: 100
Provably Fair:No
Jackpot: No
Technology used:HTML5
Theme slot: Fantasy
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Description of the Slot 

Play’n Go’s fictional icon, Riche Wilde, has come back again, this time exploring a totally different landscape. The famed explorer has already featured in several high-quality slots from the game provider, including Book of Dead. This time, in the Tome of Madness, Mr. Wilde is set to charter the fictional universe based on H.P. Lovecraft’s Cthulhu Mythos. 

The slot’s layout is arranged in a 5×5 grid, and instead of paylines, it has a cluster pays mechanic to mete out real money winnings. In addition, Tome of Madness incorporates some highly exciting albeit somewhat confusing bonus features. But we have deciphered each of these elements to render a lucid interpretation. So, let us hop onto this extraterrestrial journey with our renowned explorer, Riche Wilde. 

Design and Audio

The game’s design clarifies from the very beginning that Cthulhu Mythos is a dark and sinister world. A spine-chilling introductory quote from H.P. Lovecraft confirms this claim. Next to the 5×5 paneled grid, we find Riche Wilde standing in his formal looks with a book in his hand. The place he is currently at looks like an abandoned gothic castle. The only light making its way into the large hall is the moonlight matched with a frequent burst of thunder. 

The terrifying gothic score falls in sync with the slot’s theme and gives ominous vibes throughout the game. Every sound seems to echo in this deserted setting, suggesting one ought to be very careful in Cthulhu’s terrain. 


Tomb of Madness is equipped with several bonus features having a unique working system. We will look into each of them and understand how they might be effective in helping you reap big returns. 


Whenever a winning combination of 4 or more identical symbols occurs on the reels, the winning symbols are removed from the grid, and new symbols take their place. If the emergence of new symbols creates another winning combination, another cascade follows. The process keeps repeating until there are no more wins on the grid.

Wild Symbols 

The slot offers you not one but three different types of wild symbols. The book of madness is the standard wild symbol, and it is followed by Riche Wilde multiplier wild, offering 2x the value on your wins. And lastly, there is an alien Mega wild symbol which only comes into effect during the bonus round. Mega Wild drops down one position with each cascade until it falls off the grid

Eye Marks and Portal Meter 

Look out for the random Eye Marks positions on the tiles. Whenever wins occur on Eye Marks, 2 special wild symbols are added to the following non-winning cascade. The count for winning symbols is kept in the Portal Meter, and whenever you get a winless cascade, the count starts afresh from zero. As the Portal Meter keeps filling, it awards several exciting rewards: 

  • Collecting 7 symbols awards 2 special wilds 
  • Collecting 14 symbols awards 2 special wilds, and if you form a winning combination with these wilds, the Abyss Portal Effect feature kicks in. 
  • Collecting 27 symbols provides 2 special wilds, and landing a win with the help of these wild symbols triggers the Void Portal Effect feature.
  • Fully charging the Portal Meter with 42 symbols triggers the Other World Free Round bonus game.

Portal Effects 

In the Abyss Portal Effect, a random row or column with the Special Wild symbol gets removed from the reel, allowing new symbols to fill up the vacant position. This, in turn, can further charge the Portal Meter. Similarly, with Void Portal Effect, a randomly chosen symbol type gets removed from the grid, leaving blank tiles for new symbols to appear. 

Other World Free Round 

Once the Portal Meter is full, the Other World Free Round bonus game becomes active. The feature awards one free round with 3 random portal effects. Overcharging the Portal Meter lends an additional portal effect every time you accumulate 3 more symbols. Up to 7 portal effects are possible in this round. 

The portal effects become effective on a non-winning cascade and include 4 special wilds, Abyss, and Void Portal Effects, which also add 4 special symbols to the reels. Furthermore, up to 11 or 12 Eye Marks can open up during the bonus game. To unlock these positions, all you have to do is land a win in that particular position. 

Once all Eye Marks are open, the Mega Wild symbol enters the reel. The Mega Wild keeps dropping one position with each cascade until it completely falls off the reels. While the symbol remains on the grid, it gives you an opportunity of landing multiple big wins. 


Four gems constitute the low-paying symbols in Tome of Madness, offering 2x to 6x the bet for landing a winning cluster of 10 or more matched symbols. Then we come across premium symbols made up of skull, ring, dagger, and octopus. The octopus symbols offer the highest payout of 100x the stake for 10 or more identical symbols. The other three symbols provide payouts in the range of 30x to 60x the stake for a similar winning combination. 

The possibility of winning the maximum payout occurs during the bonus game, where you can land the highest win of 2000x the bet amount


Play’n Go’s popular explorer Riche Wilde is set out on a quest to discover the secrets behind the Cult of Cthulhu – from the fictional universe of H.P. Lovecraft. The journey involves Riche’s hunt of finding several ancient relics, artifacts, and, most importantly, the Book of Madness. 


Riche Wilde and the Tome of Madness is a highly volatile slot. So, wins might not frequently occur in the game, but once they do, you stand better chances of landing a few big ones. 


About the Game Provider 

Play’n Go started its operations in 2005, and from a small team of igaming experts, the company now has over 600 employees from all over the world. Currently, the game provider has casino operators in more than 25 jurisdictions, which is a remarkable feat. Apart from providing games to operators, Play’n Go also excels in providing back-end solutions, thereby providing a more dynamic service model.

Undoubtedly, Play’n Go is one of the biggest game providers in the igaming industry today. And now, the company’s tie-up with several crypto casino operators, Play’n Go is all set to dominate the industry for many more years to follow. 

Final Considerations 

Tome of Madness leaves little room for complaints except in one major department: clarity! It has a uniquely built and somewhat complicated features system that might take a while for players to grasp. Besides that, the slot performs pretty well in providing full-on entertainment matched with an excellent math model. Even the game’s RTP of 96.59% is pretty impressive. 

However, as for the maximum prize, if you can settle for winning up to 2000x the bet, then all’s well. If not, it is best to look for other Play’n Go high variance slots that max out at much higher payouts. 

Other Slots by Play’n Go 


Understanding the features of Riche Wilde and the Tome of Madness might take a while, but with our review, we hope to make things easier for you. If you have any questions regarding the slot, feel free to leave your query in the comment box below. We will reach out to you as early as possible!


Rohit Singh

Rohit Singh

Meet Rohit, our go-to slots expert! Our writer's team consists of first-hand gamblers, with extensive knowledge of all casino-related matter, and Rohit is no exemption. When he’s not writing slots reviews, he spends his time playing and investigating new slots, in order to be able to spread his knowledge to our visitors in the best possible manner! We advise you to read through his slot reviews carefully, as they are as detailed as they get and will bring you closer to the enjoyable slot experience, and ultimately, the opportunity to win big!

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