Play'n GO Released 1970

Tome Of Madness Slot

94.52% RTP
4.4/5 (90 votes)
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Tome Of Madness
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RTP 94.52%
Volatility High
Min Bet £0.10
Max Bet £100.00
Max Win 10,000x
Paylines Cluster Pays
RTP Distribution How Tome Of Madness compares to all slots we review
90% 93% 96% 99%

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Tome Of Madness Slot Features

Cluster Pays
Win by landing 4 or more matching symbols in connected horizontal or vertical clusters on the 5x5 grid.
Cascading Wins
Winning symbols disappear and new ones drop down, creating potential for consecutive wins from a single spin.
Portal Meter
Each winning cascade charges the meter on the left, unlocking Special Wild features at different levels.
Special Wilds
Three different wild types activate through the Portal Meter to help create winning clusters.
Mega Wild Feature
Fully charged Portal Meter triggers the Mega Wild transformation for enhanced winning potential.

Our Tome Of Madness Slot Review

This cascading cluster pays slot delivers high volatility thrills wrapped in Lovecraftian atmosphere. The 96.59% RTP is solid, though the 2,000x max win sits below average for this volatility tier. The Portal Meter progression system adds strategic depth as cascades charge multiple wild features, making it ideal for players who enjoy mechanics-driven gameplay over massive win potential.

Best for: High Rollers Thrill Seekers High Risk
Dan Thompson
Dan Thompson
Slot Analyst

A UK-based online slots analyst with over 15 years in the iGaming industry. Specialising in RTP analysis, volatility profiling, and bonus mechanic breakdowns across all major UKGC-licensed platforms. Known for delivering honest, data-driven reviews that help players make informed choices.

Last updated: 21 February 2026