Release the Kraken Slot

Release the Kraken hides beneath the ocean on a 5x4 grid with 20 paylines and a colossal sea monster that wraps its tentacles around the reels during the bonus feature. When those tentacles squeeze the grid, they convert entire reel sections into wilds with a crushing animation that makes the grid frame crack and groan under the pressure. The visual of a kraken's massive tentacles crushing the reel frame while giant amber eyes peer from behind the grid is one of Pragmatic's best moments of character design and animation.

Dual Feature System

Two distinct bonus features exist in this game, and understanding their difference is crucial to managing your expectations. Standard free spins trigger on scatter symbols and play like normal free spins with enhanced wild frequency on the center reels. Decent but unremarkable. The kraken bonus triggers separately when three kraken symbols appear simultaneously, which is a much rarer event. The kraken bonus is the defining experience of this slot. When it fires, tentacles animate from the dark edges of the screen, grab specific reel positions with visible suction cups, and convert them to wild symbols. Each tentacle grab converts two to four positions. Multiple tentacles can grab simultaneously on the same spin.

I played 290 spins. Standard free spins triggered three times with returns of 18x, 45x, and 60x. Average results that would not make anyone write home. The kraken bonus triggered once during the entire session, and it was absolutely worth the wait. Four tentacles grabbed the grid across three consecutive spins, converting 11 total positions to wilds. On a 20-position grid, 11 wilds means more than half the grid is wild. The accumulated value from those three tentacle-enhanced spins totaled 280x. That single kraken activation was worth substantially more than all three free spin rounds combined.

Sunken Treasure and Base Game

The sunken treasure mechanic is a secondary feature where golden chest symbols can appear during the base game and award instant prizes. These chests show up roughly every 25 spins and award between 2x and 20x bet. Minor additions to the running balance, but they break up the base game grind and give you something to anticipate between the two main features. On slow sessions, a 15x treasure chest can feel like a lifeline.

Deep Ocean Atmosphere

The deep ocean theme creates genuine atmosphere that most underwater slots fail to achieve. Dark water with limited visibility, bioluminescent particles drifting slowly across the background, silhouettes of sea creatures passing behind the reels at irregular intervals. The treasure chest premium symbol overflows with gold coins and glowing pearls. The diver symbol feels appropriately small and vulnerable against the oceanic scale of everything else on screen. Sound design uses low-frequency rumbles suggesting deep water pressure, distant whale calls echoing through the abyss, and the unsettling creak of the kraken's tentacles when they begin to appear at the grid edges before a bonus trigger.

Summary

96.50% RTP, high volatility, 5,000x ceiling. Release the Kraken has a genuine split personality. The standard free spins are mediocre and forgettable. The kraken bonus is exceptional and memorable. That asymmetry between features creates an interesting session dynamic where each standard free spin trigger carries a slight disappointment because you know the kraken would have been better. The ongoing comparison keeps the anticipation alive across the entire session. The sequel addressed this exact frequency imbalance, so if you want more kraken action per session, skip straight to Release the Kraken 2.