Aquanauts: Slot Overview

The NOAA Ocean Exploration website notes that researchers estimate the oceans may contain up to 1 million species (not counting most microorganisms), and that around two-thirds of them—possibly more—still haven’t been discovered or formally described. Put simply, there’s a huge amount happening beneath the saltwater that we know nothing about. Maybe an ancient leviathan lies on the seabed, dormant until inquisitive divers with underwater torches disturb it after ages of sleep, sending it to the surface to terrorize humanity like Cthulhu or Godzilla. Or maybe the deep is far less sinister?

One way to explore that idea is by joining the kind of adventurers featured in Alchemy Gaming‘s online slot Aquanauts. This deep-ocean expedition drops players below the waves in pursuit of treasure. The base game seems set during the descent, with little more than an empty blue backdrop behind the game’s 5×5 grid layout. At the very bottom of the sea, the Mariana Trench plunges to almost 11 km beneath the surface, where darkness, freezing temperatures, and crushing pressure make it among the most inhospitable environments on Earth. Trigger the free spins and a shipwreck appears, so we’re likely not quite that far down—but Aquanauts remains a shadowy, enigmatic setting all the same.

It’s also a very high-volatility title and is offered in four RTP configurations, with the top setting at 96.26%. With 3,125 ways to win, wins land at close to 1 in 3 spins by forming matches left to right, on any row starting from the far-left side of the grid. Fully playable across devices, the stake options begin at 30 p/c and rising to $/€21 per spin.

Across the reels you’ll find ten regular paying symbols. The lowest four are sea creatures, then come submarines and treasure chests, followed by four higher-value character icons. A five-of-a-kind way pays roughly 0.67 to 0.93 times the stake for the non-character symbols and 1.5 to 6.67 times the bet for five of the human symbols. Wilds pay even better—up to 10x the bet for a five wild winning way—and they also substitute for any standard paying symbol.

Aquanauts: Slot Features

Aquanauts includes a pair of mechanics that can occur in both the base and base game: Rolling Reels with a progressive multiplier, and Echo Rolls. Additional elements are the Bonus Wheel and the Upsizer feature, which both take place before the free spins start.

Rolling Reels

Rolling Reels is effectively a cascading win feature. Whenever a winning combination lands, those symbols are removed from the reels. The remaining icons fall into the empty spaces and fresh symbols drop in from above. If this creates another win, Rolling Reels activates again. Alongside this, each base game Roll increases a win multiplier by +1. In the base game, once no further wins appear, the multiplier returns to its starting value on the next spin.

Echo Spins.

Following any win, the Echo Roll feature has a chance to trigger randomly. Rather than refilling with mixed symbols, Echo Roll drops in identical random high, low or wild symbols, ensuring a win is created.

Free Spins

Landing 3 scatter symbols awards 8 free spins, plus 2 extra free spins for every additional scatter that appears. Before the free spins begin, two pre-bonus steps take place. First, players spin the Bonus Wheel for +2 or +4 free spins, x2 or x3 Win Multiplier increments, wild symbols only on Echo Rolls, or no low symbols on Echo Rolls. After that comes the Upsizer feature, giving players the option to buy any of the modifiers they didn’t pick up from the Bonus Wheel. The game automatically works out and shows the added price for doing so. The only other point worth noting is that whenever a scatter lands during the bonus, +1 free spin is added to the spins remaining.

Aquanauts: Slot Verdict

One thing that stands out about Alchemy Gaming is the studio’s tendency to think big. Its link to Microgaming gives it access to a broad toolkit of familiar mechanics, but to Alchemy’s credit, it usually doesn’t just attach them to a 9 Masks of Fire type of slot and leave it there. With Aquanauts, the team avoided the standard setup and instead dialed the concept up a notch.

Rolling Reels is a good illustration. It’s Microgaming’s take on cascades/reactions/avalanches and is widely used across its partner studios. While many games cap the Win Multiplier after something like four consecutive wins, Aquanauts removes the cap entirely and even adds the possibility of boosting the size of the Win Multiplier increments.

That said, it took a while for Aquanauts to reveal its best side. The early descent phase felt fairly quiet: there weren’t many back-to-back Rolls, Echo Roll didn’t show up often, and the simple—some might say bland—blue backdrop required a bit of getting used to. But once the game starts building pace, it can change quickly. Free spins are likely where that shift happens most, since the Win Multiplier doesn’t reset and the Upsizer feature lets players crank the round up to its maximum potential. Upsizer is a neat concept and has appeared before in Chronicles of Olympus X UP. Fully maxing the modifiers can make the bonus round intense, though the added purchases can mount up. On paper, Aquanauts can deliver wins of up to 50,000x the bet, so the urge to buy every available add-on when free spins land may be hard to resist.

It takes a particular kind of player to face whatever dangers might be waiting far below the ocean’s surface. In Aquanauts, those depths can also hide serious prizes, and Alchemy has created a thrilling option for anyone who enjoys the chance to go all-in once free spins begin, backed by a stack of add-ons.