Book of Medusa — review
Spinomenal's gorgon-themed slot game. All figures on this page have been taken from the game's own data.
Facts
Petri Halkola · Slot and casino reviewsUpdated 2026-08-04 · Luvut pelin omista tiedoista
Book of Medusa is a slot game released by Spinomenal on 6. tammikuuta 2026 that draws on the Medusa myth: the theme list includes Ancient civilizations, Book, Greece and Helmet. Among the 103 Medusa slots in our catalog it is one of the newest releases.
The game's official feature list is this time shorter but clear. We played the game ourselves: below we go through what the listed mechanics mean, and tell you directly what we saw in the session — and what we didn't.
Mechanics and bonuses
According to the game's official feature list — no guesses
Wild and substituting symbols
The feature list includes Expanding Symbols and Wild. Wild symbols complete winning combinations during the base game.
Free spins
The game info lists Free Spins. In this session the scatters didn’t land into spins, so we don’t describe the free spins’ flow — we only report what we actually saw.
Cascade and bonus mechanics
The feature list mentions Book of ... mechanic — symbols involved in wins can be removed and replaced or trigger their own bonus round.
Scatter symbols and line wins
In our session wins came as small line hits (0,05–0,29). The feature list mentions Scatter symbols; we didn’t read the exact grid and line structure from the info panel.
Buy bonus and add-on bets
Buy Feature and Cheats tool are listed in the game info. We didn't test the bonus purchase in this session, so we won't state its price or terms.
Book of ... mechanics: As with the genre, one symbol acts as both a wild and a scatter and can trigger expanding symbols on free spins. In this session we did not reach the spins, so we do not describe their mechanics — we only report what we saw ourselves.
RTP, volatility and win potential
What the numbers mean for the player
RTP and its reliability
The game’s RTP figure has not been published in our data, and we did not read it from the game info panel during this session. We will not guess the percentage — we prefer to leave it open rather than give a wrong number.
Volatility and win potential
No official volatility figure has been published, and we do not guess it. In our session the base game paid frequently but with small hits (0.05–0.29), which suggests moderate swing — but one session isn’t enough to reach a final verdict on volatility.
Pros
- Buy bonus and/or bonus stake for the impatient
- Fresh 2026 release
Cons
- RTP has not been disclosed — and we did not find it in the info panel
- Maximum win is not disclosed in the game's information
- Only small line wins in the session; the bonus didn’t trigger
A straightforward book slot — the base game paid out modestly
We played the session at base stakes. Book of Medusa is a familiar book formula with a clear gorgon theme, but in our session wins stayed as small line hits (best 0,29), and we didn't reach free spins where the genre's big wins typically occur. Stars are based on this session; the game did not show RTP, max win or paytable, and we won't guess them.
Petri Halkola · MedusaSlotsin slot reviews
Game session
We play every catalog slot ourselves before the final review
We played Book of Medusa at base stakes. The base game is familiar book-slot fare: a clear gorgonite theme and a relaxed pace where wins come from line hits. In our session hits were small but regular — at best 0.29× and several around 0.05×.
We did not trigger free spins in this session, so we did not see the expanding symbol of the book mechanic in action — where the big wins of the genre usually occur. Below you can only see what we actually played.
Rules and payouts table
Read from the game’s own Game Rules and paytable panel
Rules and pays – Book of Medusa
The game uses 5 reels, 3 symbol rows and 10 fixed paylines.
All symbol wins are formed from left to right starting from the first reel.
The Golden Book of Medusa functions as both Wild and Scatter symbol, and the Wild replaces other paying symbols.
Three, four or five scattered Wild/Scatter symbols pay 2x, 25x or 250x total bet respectively.
At least three Wild/Scatter symbols trigger 10 free spins, and the scatter payout is added to regular line wins.
At the start of Free Spins the player chooses one expanding symbol; Wild/Scatter is not among the selectable symbols.
The chosen symbol expands in free spins only when the expansion forms a win.
An expanding symbol pays on all active lines even if the symbols of the winning combination are not on adjacent reels.
Wins from expanded symbols are counted separately from the wins of the original reel result.
Free spins can be retriggered and add 10 new free spins.
Only the highest symbol combination? is paid on each payline, but wins on different lines are added together.
A line win is multiplied by the selected line bet; at the time of checking 0,01 line bet formed 0,10 total bet.
The highest symbol pays 5 000x, 1 000x, 100x and 10x the line bet for five, four, three and two symbols.
The game's startup screen states the maximum win is 5 000 times the bet.
With the Buy Feature button you can buy the free spins directly; the purchase price depends on the stake chosen.
| Symbol | 8–9 | 10–11 | 12–14 | 15+ |
|---|---|---|---|---|
| Premium symbol 1 | — | — | — | — |
| Premium symbol 2 | — | — | — | — |
| Base symbols | — | — | — | — |
Multipliers and mechanics were read from the game's own info and paytable panel, not from other sources.
Where to play Book of Medusa -slot
Withdrawal tested personally, selection checked against this catalog
100 free spin
Min. deposit 20 €
Terms read to completion in submission
Always confirm wagering terms from the casino's own site before depositing.
- 75 free spin
- Min. deposit 20 €
Wagering 40× (bonus + spins)
Maximum bet 5 €, valid 7 days. Only slots contribute 100 %.
- Package up to 335 free spin
- Min. deposit 20 €
- Wagering 40×, also FS wins
For new players only. Free spins are awarded in batches of 25.
Checked 2026-08-13. Bonus figures and terms have been read from the casinos' own pages — we do not publish figures we have not seen ourselves. A casino has only one welcome bonus.
18+ · Play responsibly · Terms and conditions apply to all bonuses · Player
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Guides and reviews — written in-house, not a translation conveyor-belt
Petri is responsible for MedusaSlots' slot and casino reviews. Every judgement is based on the game's official information and a personal play session — missing numbers are spoken aloud, not guessed.
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Frequently asked
Quick answers about Book of Medusa slot
What is the RTP of Book of Medusa?
The game’s RTP figure is not listed in our data, and we did not read it from the game info panel during this session. We will not guess the percentage.
What is the maximum win of Book of Medusa?
The maximum win is not listed in the game's details. We do not publish a figure we haven't seen.
Does the game include free spins?
Yes. The feature list mentions Free Spins. In our session the scatters didn’t land often enough to trigger the rounds, so we couldn’t capture how they play out this time.
When was Book of Medusa released and who made it?
Game released by Spinomenal 6.1.2026.
