Introducing Tome of Madness
Tome of Madness is a dark horror-adventure slot from Play'n GO, released in 2019. It runs on a 5x5 grid with Cluster Pays, so I need 4 or more matching symbols touching horizontally or vertically. The key idea is the Portal Meter, which charges through winning cascades and unlocks stronger effects as the sequence grows.
I like the mechanical depth more than the ceiling. The base game has proper progression, Eye Marks, special wilds and symbol-clearing effects, so it is never a flat reel-spinner. Still, for serious players, the 2,000x top end is not enough compensation for the very high volatility and the long grind to bonus territory.
Symbols And Paytable
Paytable-wise, there are 4 high-value and 4 low-value regular symbols. The top payer is the Octopus Pendant at x100 for 10 or more in a cluster, then Dagger at x60, Gemstone Ring at x40, and Cthulhu Skull at x30. Purple, red, blue and green crystals cover the low end, paying from x6 down to x2 for 10+ symbols.
Rich Wilde is the key premium wild for me because it doubles any win it helps complete. The Book is a Special Wild added by features, and the Cthulhu symbol becomes a Mega Wild in the bonus. All of them substitute for regular symbols, but the multiplier wild is the one that can push a sequence from acceptable to meaningful.
Symbol Payouts
| 10+ | x100 |
| 9 | x50 |
| 8 | x32 |
| 7 | x16 |
| 6 | x8 |
| 5 | x4 |
| 4 | x2 |
| 10+ | x60 |
| 9 | x30 |
| 8 | x24 |
| 7 | x12 |
| 6 | x6 |
| 5 | x3 |
| 4 | x1.5 |
| 10+ | x40 |
| 9 | x20 |
| 8 | x16 |
| 7 | x8 |
| 6 | x4 |
| 5 | x2 |
| 4 | x1 |
| 10+ | x30 |
| 9 | x15 |
| 8 | x12 |
| 7 | x6 |
| 6 | x3 |
| 5 | x1.5 |
| 4 | x0.7 |
| 10+ | x6 |
| 9 | x4.5 |
| 8 | x4 |
| 7 | x2 |
| 6 | x1 |
| 5 | x0.6 |
| 4 | x0.4 |
| 10+ | x5 |
| 9 | x4 |
| 8 | x3.2 |
| 7 | x1.6 |
| 6 | x0.8 |
| 5 | x0.5 |
| 4 | x0.3 |
| 10+ | x4 |
| 9 | x3 |
| 8 | x2.4 |
| 7 | x1.2 |
| 6 | x0.6 |
| 5 | x0.4 |
| 4 | x0.2 |
| 10+ | x2 |
| 9 | x1.5 |
| 8 | x1.2 |
| 7 | x0.6 |
| 6 | x0.3 |
| 5 | x0.2 |
| 4 | x0.1 |
Tome of Madness Bonuses And Special Features
Cascading wins are the engine here. Winning clusters disappear, new symbols drop in, and every symbol used in those wins feeds the Portal Meter. At 7 collected symbols, 2 Special Wilds are added. At 14, I get 2 more Special Wilds and can trigger Abyss, which removes a full row or column. At 27, the Void effect can remove all symbols of one regular type from the grid.
Eye Marks add another layer. If a winning cluster lands on an Eye Mark, 2 Special Wilds are added when the cascade stalls, often extending the sequence. The free feature is the Other World Free Round, triggered by collecting 42 symbols in one winning run. It gives 1 free spin plus 3 Portal Effects, and every extra 3 symbols above 42 adds another effect, up to 7 total.
Inside the bonus, the same systems stay active, and that is where the Cthulhu Mega Wild matters. Open all 11 or 12 Eye Marks and a 2x2 Mega Wild drops in, then moves down the grid with each cascade. That is the main route to the top payout. Some versions also include Bonus Buy, but I did not find a reliable fixed cost in these reviews.
Bonus Buy Options
RTP, Volatility And Max Win
RTP is a moving target here. The best-known version sits at 96.59%, but reviews also list 94.52%, 91.59%, 87.52% and even 84.50%. That matters more than usual because this is a very high-volatility slot with plenty of dead spins. With a proper bankroll, I can tolerate slow sessions, but not on a low-RTP build.
The max win is 2,000x. That is the problem. I do not mind variance if the upside pays for it, but here the ceiling is too low for this variance. The base game can drag a bit, the bonus can take many spins to trigger, and even a strong hit may not justify serious high-stakes exposure.
