Secrets of Atlantis Slot Demo And Review

Secrets of Atlantis Quick Verdict

The Secrets of Atlantis slot demo and review covers NetEnt’s underwater-themed release from August 2016, now operated under the Evolution Group umbrella. This medium-volatility slot runs on a 5-reel, 4-row grid with 40 fixed paylines paying in both directions. The confirmed base RTP is 97.07%, which sits well above the industry average, and the maximum win is 1,600x total bet. The defining mechanic is a random Highlight Feature that fills positions on reels 2, 3 and 4 — once all 12 positions are covered, the Colossal Symbols Re-Spin awards a single re-spin with a giant 3×4 symbol block on the middle reels.

The base RTP of 97.07% is confirmed at the NetEnt official game page (games.netent.com), adventuregamers.com, and penny-slot-machines.com — no conflicting figures were identified across these primary sources. Data confidence for this review is high: all four bonus features are fully documented, the math model is complete, and layout details are verified by eight or more independent sources.

RTP, volatility, and bonus mechanics are subject to change. Verify current figures at the operator site before depositing.

Math Model

Secrets of Atlantis has a base RTP of 97.07%, confirmed by developer documentation published at games.netent.com. Volatility is medium, meaning players can expect moderate bankroll swings with a balanced frequency and size of wins — sessions tend to sustain longer than high-volatility titles at the same stake level without the frequent drought periods.

RTP Configuration Warning

Developer documentation published at games.netent.com states the base RTP as 97.07%. This is corroborated by findmyrtp.com, slotsmate.com, gamblingzone.com, casinos.com, and adventuregamers.com. However, findmyrtp.com confirms that NetEnt supplies this slot with multiple RTP configurations — some casinos deploy a 95.1% variant without prominent disclosure. The 97.07% headline figure applies only at the highest setting. UKGC-licensed operators must display the configured RTP within the game interface — check the help panel before depositing. This review was unable to verify which RTP setting is active at individual operators.

One source (slotcatalog.com) rounds the figure to 97.10% — a negligible rounding difference, not a separate configuration. The 95.1% figure reported by great.com represents a genuine lower operator-selectable RTP setting.

Hit Frequency

A single source (findmyrtp.com) reports a 22.9% hit frequency. This figure has not been confirmed by a second independent source. If accurate, it means roughly 1 in every 4.4 spins produces some return — higher than many medium-volatility competitors and consistent with the slot’s reputation for sustaining balances across longer sessions. For context, many medium-volatility slots fall in the 18-25% range, placing Secrets of Atlantis toward the upper end.

Max Win Calculation — Clarified

Sources widely disagree on the maximum win figure: some cite 4,000x coin value, others 3,200x, and one outlier (slotslaunch.com) erroneously claims 1,600,000x. The confusion stems from NetEnt’s coin-based betting system. NetEnt’s official documentation states 4,000x coin value. At maximum bet level 10 with a coin value of 1.00, each line bet equals 10.00 coins, and the total bet across 20 base paylines equals 200.00. The highest-paying symbol (Oyster’s Pearl) pays 400x line bet for five of a kind. With Win Both Ways active, a single five-of-a-kind line win from both directions does not stack additively into a single line — but overlapping wins across multiple paylines can combine.

The most conservative confirmed figure relative to total bet is 1,600x. The 1,600x max win at £200 maximum stake equates to £320,000. At minimum stake of £0.20, the same win equates to £320. This win is achievable only during the Colossal Symbols Re-Spin when a Colossal Nudge Wild Mermaid fills the entire 3×4 middle block alongside premium symbols on reels 1 and 5.

No feature buy option was identified in developer documentation or casino game pages reviewed for this title — all bonus features trigger randomly.

Players evaluating medium-volatility slots with above-average RTP may find our Mustang Gold review useful — that Pragmatic Play title shares a comparable emphasis on base-game-triggered random features, though it skews higher in volatility with a jackpot structure absent from Secrets of Atlantis.

Bonus Features

Highlight Feature

The Highlight Feature activates randomly on every spin. Random positions on reels 2, 3 and 4 are highlighted behind the landing symbols. Highlights accumulate across the 12 available positions (3 reels x 4 rows). When all 12 positions are fully highlighted at the end of a spin, the Colossal Symbols Re-Spin is triggered. No scatter symbol is required — this is the sole trigger path to the game’s primary bonus mechanic. The Highlight Feature confirmed in operator game descriptions at LeoVegas and in NetEnt’s official documentation.

The exact probability of triggering a full highlight has not been published by NetEnt. SlotTracker community data across 826,299 tracked spins records a bonus frequency of approximately 1 in 35 spins (2.86%), providing a rough indication of how often the Colossal Symbols Re-Spin activates in practice — though this is community-tracked data, not developer-confirmed.

Colossal Symbols Re-Spin

Triggered exclusively when the Highlight Feature fills all 12 positions on reels 2, 3 and 4. During the Re-Spin, these three reels merge into a single display showing a giant 3×4 Colossal symbol block. One re-spin is awarded. The Colossal symbol can be any symbol on the paytable, including the Mermaid Wild. If the merged block lands as a Colossal Wild, it fills the entire middle section with wilds — this is the only realistic path to wins exceeding 100x total bet.

If the 3×4 block is fully highlighted again during the re-spin, an additional re-spin is awarded. However, only one re-spin triggers at a time, and no multipliers are applied during this feature. AskGamblers player review patterns note that the single re-spin format feels limited compared to free-spins-based alternatives — the variance within this feature is concentrated into one spin outcome.

Nudge Wild (Mermaid)

The Mermaid Wild is a stacked symbol spanning the full 4-row height of a reel. When it appears partially on any reel during the base game or Colossal Re-Spin, it automatically nudges up or down to cover the entire reel. This eliminates partial-wild frustration common in stacked-wild slots. During the Colossal Re-Spin, a Colossal Mermaid covers the entire 3×4 block — this is the structural trigger for the slot’s highest-value outcomes. The Wild substitutes for all other symbols but does not pay independently.

Players interested in how nudge mechanics compare to cluster-based wild expansion may find our Reactoonz slot guide useful — Reactoonz uses a cluster-pays engine where wild generation follows a charge meter rather than a random nudge, offering a different variance profile within a similarly structured grid.

Win Both Ways

Win Both Ways is a permanent base-game mechanic, always active across all spins. Winning combinations pay from left to right and from right to left. The slot uses 20 base paylines, and both directions are evaluated independently, yielding 40 total paylines. This effectively doubles win frequency compared to standard left-to-right-only slots and contributes directly to the high hit frequency figure. No additional trigger is required — it applies to every spin including the Colossal Symbols Re-Spin.

Base Game

Secrets of Atlantis uses a standard fixed grid of 5 reels and 4 rows with 40 paylines (20 base paylines evaluated in both directions). The underwater Atlantis theme features gem-shaped symbols styled as sea creatures alongside a tranquil soundtrack frequently praised in Reddit r/onlinegambling discussion threads.

Special Symbols

Mermaid (Nudge Wild) — substitutes for all other symbols. Stacked 4-high with automatic nudge to fill the entire reel. Does not pay on its own line.

Oyster’s Pearl (Clam) — highest-paying regular symbol at up to 400x line bet for five of a kind.

Ruby Gem — high-paying symbol, up to 70x line bet for five of a kind.

Emerald Gem — high-paying symbol, up to 60x line bet for five of a kind.

Sapphire Gem — medium-paying symbol, up to 50x line bet for five of a kind.

Low-paying symbols include the Crab, Turtle and Jellyfish, with the Jellyfish paying 15x line bet for five of a kind at the lowest tier.

Bets range from £0.20 to £200 per spin. Mobile compatibility is confirmed — the HTML5 build adapts to touchscreen devices with no reported lag in editorial reviews from LuckyMobileSlots.

Where to Play

Secrets of Atlantis is available at UKGC-licensed casinos carrying the NetEnt game library. Only one UKGC-licensed casino — LeoVegas — was independently verified as carrying this title in the research data. CasinoHawks was referenced in some sources, but CasinoHawks is an affiliate review site, not an operator casino, and is excluded from the casino table.

With fewer than two independently verified UKGC casinos confirmed, a full casino comparison table is not presented here. This reflects the age of the title (released 2016) and the consolidation of NetEnt’s catalogue into the Evolution Group distribution network — some older titles have reduced visibility in newer casino lobbies. Search for Secrets of Atlantis within the game library of your preferred UKGC-licensed casino. Open the game information panel and confirm the active RTP before depositing.

Non-UKGC operators SkyCrown Casino and Dolly Casino were identified as carrying the game under Curacao licensing. These casinos are not subject to UKGC player protection requirements including GamStop, IBAS ADR access, or mandatory deposit limit tools. This review does not endorse play at non-UKGC operators.

Operators can configure Secrets of Atlantis at a lower RTP setting of 95.1% without prominent disclosure. The 97.07% headline figure applies only at the highest setting. UKGC-licensed operators must display the configured RTP within the game interface — check the help panel before depositing.

A free demo version of Secrets of Atlantis is available to play without registration — use the demo player above to test the bonus mechanics before committing real money.

Players comparing the Colossal Re-Spin’s single-spin concentrated outcome to feature-buy alternatives may find our Gates Of Hades Demo And analysis useful — that title offers purchasable bonus access at defined cost multipliers, providing a direct contrast to the random-trigger-only model used in Secrets of Atlantis.

Similar Slots

Players who enjoy the Win Both Ways mechanic, Nudge Wilds and underwater theme of Secrets of Atlantis may also consider the following titles.

RTP figures for Ariana and Lord of the Ocean reflect third-party database data and have not been independently confirmed from developer documentation.

Starburst is the closest mechanical comparison — both NetEnt titles share Win Both Ways paylines and expanding wilds with no free spins round. Starburst operates at lower volatility with a 500x max win ceiling, making it more suitable for players who prefer tighter variance and shorter sessions. The 96.09% RTP is confirmed and sits 1 percentage point below Secrets of Atlantis, which gives the reviewed title a slight mathematical edge for wagering requirement clearance.

Ariana from Microgaming shares the mermaid underwater aesthetic and medium volatility profile but uses expanding symbols during a free spins feature — a structural difference for players who specifically want a dedicated free spins round alongside the underwater theme.

Lord of the Ocean from Greentube offers a high-volatility alternative within the ocean genre. Its traditional free spins with expanding symbols during the bonus round give it a win profile with larger individual payouts but longer drought periods. Players who find Secrets of Atlantis too steady may prefer this higher-variance option.

Secrets of Atlantis Verdict

Secrets of Atlantis suits bankroll-conscious players and wagering-requirement grinders — the confirmed 97.07% base RTP ranks among the highest in the NetEnt catalogue and the medium volatility sustains balances across extended sessions.

Strengths: The 97.07% RTP is confirmed across seven independent sources and developer documentation, placing it firmly in the top tier for return percentage. The Win Both Ways mechanic doubles effective paylines to 40, directly contributing to the reported 22.9% hit frequency. The Colossal Symbols Re-Spin with Nudge Wild Mermaid provides a distinctive visual and mechanical peak that differentiates the game from standard free-spins formats. Mobile compatibility is confirmed across editorial sources.

Weaknesses: The 1,600x max win is modest by current standards — modern medium-volatility releases frequently offer 5,000x or higher. The absence of a traditional free spins round and any form of multiplier limits the ceiling for individual bonus outcomes. BigWinBoard forum patterns suggest that practical wins rarely exceed 20-70x total bet, with the Colossal Re-Spin’s single-spin format concentrating both opportunity and disappointment into one outcome. Some casinos deploy the 95.1% RTP variant without clear disclosure, which erodes the primary mathematical advantage of this title.

Responsible Gambling

Set a session budget and a time limit before playing Secrets of Atlantis. Medium volatility sustains balances longer than high-volatility titles, but prolonged sessions can still result in losses exceeding expectations. Use the mandatory deposit, loss, and session time controls available in your UKGC casino account settings to enforce your limits mechanically.

The RTP figure in this review applies at the highest operator setting (97.07%). Lower variants at 95.1% may be active — verify in the game information panel before depositing. If you need to restrict your access to gambling, GamStop registers you simultaneously with all UKGC-licensed operators in a single step. Further support is available from GamCare, BeGambleAware, and Gamban, which blocks gambling apps and websites across your devices.

Verified against developer documentation, UKGC casino game libraries, and independent review sources available at time of review.