Secrets of Atlantis Slot Review: Highlight Re-Spins and Colossal Symbols

Secrets of Atlantis uses a randomly highlighted middle section to change three reels into one temporary Colossal reel. The Highlight Feature can mark reels two, three and four; when all three are highlighted, a Colossal Symbol Re-Spin begins and the middle reels merge. A full highlight across that merged reel can award an additional respin. The saved source also documents Nudge Wilds, including how a partially landed symbol can be moved into full-reel coverage, but it does not provide the full game’s remaining bonus rules.

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Secrets of Atlantis at a glance

Provider	NetEnt
Genre / theme	Fantasy
Game type	Video slot
Reels / grid	5 reels × 4 rows
Reference RTP	97.07%
Volatility	5.3 (catalog scale)
Payout mechanic	40 lines
Maximum win	1,600× bet
Release date	24 August 2016
Main features	Highlights on reels 2, 3 and 4 trigger a merged Colossal-symbol respin; a full highlight in the merged reel can award another, while partial Nudge Wilds fill a reel.

RTP and stake limits can vary by version and market. Check the information screen in the game you open. Maximum win is a ceiling, not an expected result.

Three highlighted reels become one

The official listing describes five reels, four rows and 40 lines, with wins both ways noted in its description. During any spin, the Highlight Feature may randomly mark symbols on reels two, three and four. If all three reels are highlighted, a Colossal Symbol Re-Spin is triggered. For that respin, those reels merge into one reel displaying 3×4 Colossal Symbols. A Colossal symbol can appear only during these respins. If the entire merged reel is highlighted during a Colossal Symbol Re-Spin, another respin is awarded.

This feature’s condition is cumulative across three specific reels: a highlight on only one or two does not meet the stated trigger. Once the feature starts, its merged reel changes the usual layout and the full-highlight condition can extend the sequence. The saved packet does not specify how many Colossal symbols appear, whether the additional respin can repeat indefinitely, or the exact payout evaluation across the merged reel. Those details remain unstated rather than being filled in from assumptions about other NetEnt games.

Nudge Wild fills an incomplete reel

Nudge Wilds can land partially or fully on a reel depending on how the spin resolves. A partial Nudge Wild is moved up or down to cover the entire reel. A partially landed Colossal Stacked Wild during a Colossal Symbol Re-Spin is also nudged into full view, covering the reel. This gives the Wild feature a direct relationship to the special merged-reel mode: the same completion rule applies to a Colossal Wild when it lands partly visible.

The source does not include an entry condition for Nudge Wild beyond its possible partial landing, nor does it describe whether it triggers additional respins on its own. It also does not state a specific Free Spins trigger or the rules for the listed Re-Spins beyond the Highlight feature. The accurate reading is therefore narrow: Nudge Wild completes reel coverage, while full highlight across all three middle reels triggers the Colossal sequence. The remaining mechanics cannot be reconstructed from the saved observations.

Catalog values and evidence boundary

The catalog lists RTP 97.07%, volatility 5.3 and a maximum payout of 1,600× bet. It identifies a 5×4 layout and up to 40 lines. These exact-title values do not indicate how often all three reels are highlighted or how often a Colossal respin earns an extension. The source’s incomplete feature detail also limits a broader assessment of its bonus structure.

Strengths and weak points

Strengths

The three-reel highlight condition and merged 3×4 Colossal reel provide a clear spatial transformation, with a full-highlight extension rule and a specific completion behavior for partial Nudge Wilds.

Weaknesses

The saved packet omits wider trigger, payout and bonus details, so the feature’s full sequence cannot be assessed. RTP and maximum payout do not fill those gaps.

Our Editor’s View

Secrets of Atlantis has a distinctive spatial premise: highlights across the three middle reels can merge them into one oversized Colossal reel, and a complete highlight there may extend the respin. Nudge Wilds reinforce the idea of completing a reel by moving a partial Wild into full coverage, including a Colossal Wild during the special respin. Mirror Mirror’s expanding feature sequence offers a fantasy-themed contrast: Atlantis merges its middle reels and completes partial Wilds instead of building its feature through expansion. The rule set is easy to visualize, but the saved packet does not explain the full trigger chain, payout handling or the rest of the Free Spins and Re-Spins features mentioned in the catalog summary. This review can assess the documented highlight and nudge behavior, not the unrecorded parts. Players interested in reel-merging mechanics may find the feature concept appealing; anyone comparing bonus depth or precise feature odds will need a fuller rules source before drawing a confident conclusion.