Secrets of Atlantis Slot Machine

The story of an advanced, Atlantean society, existing off the coast of Europe and shaping the world was something that captured many minds, and has now come to be the key theme of this 5x4 slot with 40 fixed paylines. Here, we have Secrets of Atlantis, a superb NetEnt slot machine that is totally free to play.

No matter how hard humans try, some mysteries have simply continued to elude us throughout the ages. While we're far from our ancestors who lived in caves and feared thunder, our knowledge of the world, while exhaustive in some areas, is sorely lacking in others.

This game offers a highlight feature that can lead into a re-spin with an absolutely massive symbol taking up the centre stage, and a nudge Wild that can move ever so slightly to fill out the reel it lands on.

The user interface offers various shades of blue, with everything cleanly labelled and marked for your convenience. The visuals certainly aren't lagging behind, with plentiful marine wildlife scattered on the reels, while the ruins of an ancient city are visible in the backdrop, long since sunk at the bottom of the ocean. The animations are serviceable but could be more polished.

You have a full reel of unique symbols to play around with in Secrets of Atlantis. A jellyfish, a turtle and a crab can be seen wandering about as low-paying symbols, while several gemstones of different shapes and colours, and a shell with its valuable pearl open for the taking, act as higher-paying icons befitting the treasures you would find in this ancient, forgotten city.

The Nudge Wild is a relatively simple special feature to understand. The symbol itself covers an entire reel at full size, but it can appear partially on the reels. When that happens, it will simply nudge itself into place, pushing out any symbols beneath to make sure it takes up the full reel and increases your chances of winning.

At the same time, while playing the game, you will notice one or more reels are always highlighted. If the second, third and fourth reel are completely highlighted by the end of a spin, it rewards a Colossal symbol re-spin. As it says on the tin, it creates a massive 3x4 symbol, which then pays out and gives you a single re-spin, with the possibility of earning more by the highlight feature appearing on one of the three reels the Colossal icon is taking up.

While it's certainly no worn-out free spins bonus, it's unclear if it's good enough as a complete replacement. The idea of a massive symbol that rewards a re-spin is exciting, and the possibility of that Colossal icon being any symbol — including a Wild — is without doubt something that will capture many imaginations.

All in all, the features are good, but they're rare, which contributes to the game's medium volatility. Secrets of Atlantis offers a 97.07% RTP, gorgeous graphics worthy of NetEnt, and decent gameplay.

Frequently Asked Questions

What is the RTP of Secrets of Atlantis slots?

Secrets of Atlantis has an RTP (Return to Player) of 97.07%, which is one of the highest in the NetEnt catalogue and well above the industry average. Despite medium volatility, the game's features are relatively rare triggers — meaning the strong RTP is largely delivered through infrequent but high-value Colossal symbol re-spins and Nudge Wild activations rather than consistent small wins.

Can I play Secrets of Atlantis slots for real money online?

Yes, Secrets of Atlantis real money slots are available at licensed NetEnt online casinos across the UK, Europe and other regulated markets. The game's 97.07% RTP is one of the main attractions for real money players seeking strong theoretical return. It runs on desktop and mobile without download, with 40 fixed paylines across a 5x4 grid.

How does the Colossal symbol re-spin work in Secrets of Atlantis?

During gameplay, reels 2, 3 and 4 are highlighted at varying levels. When all three of these reels are completely highlighted at the end of a spin, a Colossal symbol feature is triggered. A massive 3x4 symbol fills the three middle reels — this can be any symbol including a Wild. The Colossal symbol pays out and awards a re-spin. If the highlight feature activates again on one of those three reels during the re-spin, the chain can continue for additional re-spins.

How does the Nudge Wild work in Secrets of Atlantis?

The Nudge Wild is an oversized Wild symbol designed to cover an entire reel. When it lands partially on the reel edge, it automatically nudges itself into a fully visible position by pushing any symbols below it out of frame. This ensures the full-reel Wild is always displayed when it appears near a reel, rather than partially clipped — making it a guaranteed full-column Wild every time it lands in view regardless of its initial position.

Why does Secrets of Atlantis have such a high RTP?

Secrets of Atlantis achieves its 97.07% RTP through the mathematical construction of its Colossal symbol re-spin and Nudge Wild features, both of which create high-value individual spin payouts when they activate. The rarity of these features (contributing to medium volatility) is balanced by their significant impact when triggered — particularly the Colossal Wild scenario, which can cover 12 positions simultaneously across 40 paylines and generate very large single-spin payouts.

What marine life symbols appear in Secrets of Atlantis?

Secrets of Atlantis features a fully ocean-themed symbol set. Low-paying symbols include a jellyfish, a turtle and a crab. Higher-paying symbols are gemstones of various shapes and colours and a shell containing an open pearl. The backdrop shows the ruins of the sunken Atlantean city at the bottom of the ocean, with the entire visual palette built around deep ocean blues that complement NetEnt's typically high production values.