How it plays
Released in June 2019, this entry sends Play'n GO's adventurer Rich Wilde against the Cult of Cthulhu on a 5x5 cluster-pays grid: connected matching symbols win, clear, and new symbols cascade into place. Bets run from €0.10 to €100.
It is a high-volatility game with a published maximum win of 2,000x the stake.
Bonus features
Winning symbols charge a portal beside the grid. Milestones at 4, 8 and 12 collected symbols trigger escalating portal features — added wilds, symbol removals and special marks — while a fully charged portal (14+ symbols in one sequence) opens The Void, a bonus mode with a giant special symbol and boosted potential.
Cascading chains rather than a conventional free-spins round drive the game; the Cthulhu-themed features are where its 2,000x ceiling is reached.
RTP versions
The standard configuration returns 96.59%. Operators can also license reduced settings at 94.52%, 91.59%, 87.52% or 84.50%, so the live RTP differs by casino and is shown in the game rules.
Verdict
Tome of Madness swaps the Book-slot mechanics of Rich Wilde's earlier outings for the Moon Princess-style grid engine wrapped in Lovecraft horror. The 2,000x cap is lower than its grid siblings, but the portal-charging loop gives it a distinct, feature-dense rhythm within the Rich Wilde series.
