Book of Dead

Book of Dead — officially titled Rich Wilde and the Book of Dead — is an Egyptian-themed video slot built by Play'n GO as part of the wider Rich Wilde series. Inside the Mainio Casino catalogue, the title sits alongside the brand's first deposit offer: 100% up to 300 € plus 25 free spins, available from a minimum deposit of 20 €. Full terms and the wagering requirement attached to that welcome package are listed on the Mainio Casino bonus page.

Game technical sheet

The table below lists the structural elements of the slot and how it relates to Mainio Casino's current offer. Figures such as the exact RTP percentage, per-line bet limits, or demo availability vary by the version an operator configures, so they are left out here rather than guessed.

Symbols, Wild and Scatter on the 5×3 grid

Play takes place across five reels, with the option to activate between 1 and 10 paylines, adjust the stake, and switch on autoplay on either desktop or mobile. The golden tomb symbol carries two roles at once: it substitutes for other icons as a Wild to help complete a payline, and it also functions as the Scatter that opens the bonus feature. Explorer Rich Wilde tops the paytable, with Osiris, Anubis and Horus forming the mid-tier symbols and playing-card icons filling the lower-paying rows.

How the expanding symbol works in free spins

Landing three or more tomb symbols anywhere on the reels during the same spin triggers the free spins round. Before the spins begin, the game randomly picks one regular symbol and grants it an expanding property that stays active for the entire round.

Whenever that chosen symbol appears on the screen in enough positions to form a win once the regular lines have paid, it stretches vertically to fill every spot on its reel. This single mechanic carries the whole bonus structure of Book of Dead — there is no separate bonus minigame layered on top.

High variance and RTP behavior

Play'n GO describes Book of Dead as a high-variance title, meaning wins land less often but can be larger when they do. The theoretical return to player (RTP) is a statistical average calculated across a very large number of spins, and short sessions can swing well above or below that figure simply because of normal volatility (Gambling Commission). No past spin affects the next one, and there is no way to predict when Scatter symbols will appear.

Play'n GO alternatives at Mainio Casino

Among the studio's other titles at Mainio Casino, Fire Joker offers a useful contrast. Where Book of Dead runs on up to ten adjustable paylines and builds its bonus around an expanding symbol in free spins, Fire Joker keeps to a compact classic fruit-machine layout driven by the Respin of Fire feature. Comparing the two makes it easier to choose between a higher-variance structure with a free spins round and a simpler re-spin mechanic.

License verification and rules in Portugal

In Portugal, offering online games of chance legally requires a license from the SRIJ (Serviço de Regulação e Inspeção de Jogos), and access is restricted to adults (Diário da República). Before registering or depositing anywhere, it is worth checking the regulator's public list of licensed operators and confirming that the site's web address matches the licensed domain exactly (SRIJ — Before playing, SRIJ — The problem of illegal gambling).

It is also worth checking the operator's official terms for its corporate identity, withdrawal rules, any applicable fees, support contacts, and the availability of responsible gambling and self-exclusion tools. This page is an independent guide to how the game works and to publicly available information about the brand; it does not confirm that the operator holds a license in Portugal, nor does it confirm that this specific slot counts toward any bonus wagering requirement.