The Lost Book of Mummy’s Curse

The Lost Book of Mummy's Curse: Slot Overview

The Lost Book of Mummy's Curse takes players into a classic Ancient Egyptian tomb-raiding setting, courtesy of developer Trusty Gaming. It's a well-worn theme in the online slot world, but this release sticks to a familiar 5x3, 10-payline format that should feel instantly comfortable to anyone who's spent time with book-themed adventure slots before.

Wins are formed the traditional way — matching symbols landing left to right across the reels, with some of the lower-value symbols able to pay from just two matches. The standout mechanic here is an expanding symbol feature that fires on any base game spin: a symbol is randomly selected, and if it forms part of a winning combination, it expands to fill the entire reel, boosting the payout in the process. It's a simple but effective way of injecting a bit of unpredictability into otherwise standard spins.

The free spins round is triggered by landing three or more scatter symbols and awards 12 free spins. Once inside the feature, a single symbol is locked in as the designated expanding symbol for the whole round, and these expanded symbols can pay out even without forming a fully connected line in the usual sense, making it easier to stack up multiple wins across a spin. Extra scatters landing during the round can add further spins on top. Players who'd rather skip straight to the action can also use a bonus buy option, priced at 100x the stake, for direct entry into the free spins feature.

On the numbers side, The Lost Book of Mummy's Curse carries an RTP of 96.32%, a solid figure that sits comfortably above the typical fairness benchmark for online slots. Volatility is rated medium (3 out of 5), so players can expect a reasonably balanced mix of smaller regular wins and the occasional larger payout from an expanding symbol chain, backed by a hit frequency of around 32.1% — meaning roughly one in three spins should return something. The maximum win sits at 3,000x the stake, a respectable if not chart-topping ceiling that keeps the game feeling attainable rather than purely lottery-style.

The overall package is a tidy, well-presented take on the expanding-symbol book slot format rather than a mechanical reinvention. Players who already enjoy this style of game will find everything works exactly as expected, while those hunting for something wildly different might find it plays it fairly safe. Either way, it's a competent, easy-to-follow release with a fair RTP behind it.

For anyone curious whether The Lost Book of Mummy's Curse suits their style of play, the free demo at johnessyslots is the simplest way to see the expanding symbols and free spins round in action before wagering anything for real.