Grimoire Slot: How to play

Grimoire is a magic-themed video slot built around a book of spells, where transforming Mystery Symbols and a Free Spins feature form the core gameplay across five reels.

Here we’ll explain the game's mechanics, its return-to-player (RTP) figure, its volatility profile, and how the features work, so you have clear factual information about the title before you decide to play.

Grimoire slot at a glance

The table below shows the key technical details of the Grimoire slot from the provider's published game information.

What is the Grimoire RTP?

An RTP of 96.44% sits slightly above the industry norm for online slots, which typically ranges between 94% and 96%. In practice, this figure describes expected behavior over millions of spins rather than what any single player will experience in one sitting. Short sessions can land well above or well below the published rate because results are governed by a random number generator (RNG).

Grimoire is independently tested to confirm that its RNG performs as published. Reputable slot providers will always submit their games to third-party testing agencies, and the RTP stated reflects the provider's certified game information.

Grimoire volatility & what it means

Grimoire carries a low-to-medium volatility rating. Lower-volatility slots tend to produce smaller payouts at a higher frequency, while the largest payouts are smaller than those in high-variance titles.

Volatility describes the pattern of a game's payout distribution over time and does not affect the outcome of any individual spin, which is always determined by a RNG.

How the grimoire slot game works

Grimoire is played on a 5-reel, 3-row grid with 20 fixed paylines. The theme places you in a sorcerer's chamber surrounded by ancient books, candles, and occult artwork, with a soundtrack that builds anticipation as symbols align. 

The low-value symbols are the four card suits, while the higher-value symbols and the special symbols carry the game's main win potential.

Mystery symbol transformation

The Mystery Symbol is the central mechanic of the Grimoire slot. In the base game, one or more Mystery Symbols can land on reels 3, 4, and 5.

When they appear, a single symbol is selected at random, and every Mystery Symbol on screen transforms into that symbol. If the transformed symbol matches the symbol on the first reel in the same row, all positions between them also convert to the same symbol.

Wild Symbols

Wild symbols in Grimoire appear only as a result of a Mystery Symbol transformation. When a Mystery Symbol reveals a Wild, that Wild substitutes for all symbols except the Scatter and the Mystery Symbol.

If a revealed Wild aligns with the first reel, the connecting positions can also turn Wild, following the same transformation rule as the standard symbols.

Free spins & sticky mystery symbols

Landing three Scatter symbols on reels 1, 3, and 5 on the same spin triggers the Free Spins feature, which awards eight free spins. During this feature, Mystery Symbols can appear on reels 2, 3, 4, and 5 and become sticky, staying locked in place for the remainder of the round.

With each additional spin, the sticky symbols and any new Mystery Symbols reveal a common pay symbol, following the same transformation mechanic as the base game.

Grimoire betting range & stakes

Grimoire uses fixed paylines, so you set your total stake per spin rather than adjusting individual lines. The minimum and maximum stakes available will be visible, and the live limits are always displayed in the control panel.

Check the stake selector inside the game here at ArenaPlus for the exact minimum and maximum that apply to your account before you begin.

Playing Grimoire on ArenaPlus

ArenaPlus is an online casino and sportsbook platform licensed by the Philippine Amusement and Gaming Corporation (PAGCOR) and operated under DigiPlus. We have a library of slots from established providers alongside live casino tables and sports betting, with local payment options for players in the Philippines.

To open Grimoire, log in to your account and go to the slots section, where you can locate the game. The bet control sets your stake per spin, and an autoplay setting is available for a fixed number of spins. Game rules and the paytable are accessible from within the game window.

If you would like to see other titles available, our wider casino games collection includes a range of slots and live dealer tables to play. You can find details of any current terms and conditions that are set out on our promotions page.

Is a free demo of Grimoire available?

Many slot games offer a demo or free play mode that lets you view the mechanics without betting real money. The demo operates using the same rules as the real-money game, which makes it an ideal way to understand different elements such as the Mystery Symbol transformation and Free Spins feature.

Grimoire Slot Summary

Grimoire is a lower-variance, feature-led slot themed around a book of spells, combining a 96.44% RTP, a 20-payline structure, a Mystery Symbol transformation mechanic, and a Free Spins feature with sticky symbols.

The information on this page is intended to help you understand how the game works. As with all slots, outcomes are determined by a RNG, and results cannot be predicted or influenced.

Frequently asked questions

ArenaPlus is a PAGCOR-licensed sportsbook open to players aged 21 and above. Gambling does not guarantee earnings or financial gains — always have a game plan and play within your means. If you'd like tools to manage your play, visit ArenaPlus's Responsible Gaming page, or contact PAGCOR at (02) 8522-0299 / www.pagcor.ph/regulatory/responsible-gaming.php. Gambling can be addictive — know when to stop.