King of Slots™ Slot Review – Free Play by NetEnt

King of Slots™ Slot Facts

The King of Slots slot from NetEnt runs on 15 independent reels across a 25-line game, carrying a 96.96% RTP that ranks it among the more generous classic-style releases in NetEnt’s catalog. Released in 2015, it dresses simple fruit symbols in a jewel-toned, regal frame and pairs them with the Sticky Win™ mechanic and tripled-value Free Spins. That mix of an old-school reel count and modern win mechanics makes this one worth a second look.

There’s no bonus buy here, so every Free Spins round has to be triggered the old-fashioned way through scatters. The free demo on this page is worth a spin to see how the 15 reels and Sticky Wins work together.

King of Slots Theme & Design

King of Slots wraps a familiar fruit-machine cast, cherries, lemons, and other classic fruit icons, in a jewel-toned, regal presentation that leans into the game’s crowned-monarch branding. A blue sapphire stands in as the game’s Wild, fitting neatly into that jewelry-box aesthetic alongside the classic fruit set. What makes the layout distinctive is the structure behind it: instead of a single connected grid, the game runs 15 independent reels side by side, each one only three symbols tall, so the board reads more like a row of miniature slot machines than one wide game. That format gives the classic symbols a more regal, orderly presentation than a typical single-grid fruit slot, matching the royal framing NetEnt built around it.

How King of Slots Plays

Every spin runs across 15 independent reels, each three symbols tall, giving King of Slots a segmented feel rather than one wide grid. Landing a winning combination sets the Sticky Win™ mechanic in motion: the symbols that formed the win lock in place while the remaining reels respin, and if that respin produces another win, those symbols lock too, with the game continuing to respin for as long as fresh combinations keep appearing. Only once a respin comes back empty does the sequence end and the accumulated wins get paid out together. The blue sapphire Wild fills in for any regular symbol except scatters, helping turn a near-miss into a completed line. Landing five or more scatters anywhere on the reels opens Free Spins at the same bet level as the trigger, where every line win is tripled, and five or more scatters landing again during the round adds another batch of spins. Free Spins, with that tripled payout, is where King of Slots’ real win potential sits, while Sticky Win keeps the base game feeling alive between triggers.

RTP, Volatility & Win Potential

A 96.96% RTP puts King of Slots comfortably above the industry average of around 96%, making it one of the better-paying classic-style machines in NetEnt’s lineup. Medium volatility keeps the swings moderate, and a 25% hit frequency means roughly one in four spins lands some kind of win, a pace that fits the frequent Sticky Win chains this game is built around. The 700x maximum payout is modest next to today’s high-volatility Megaways titles, but it lines up with a game designed for steadier, more frequent returns rather than rare knockout hits.

Our Verdict on King of Slots

This King of Slots slot review suits players who like classic fruit symbols paired with mechanics that keep a round alive, thanks to Sticky Win chains and tripled-value Free Spins. The 96.96% RTP and Medium volatility make it a comfortable, steady pick rather than a high-risk one, and the free demo on this page is worth a try to see the 15-reel layout in action. The tradeoff is a 700x ceiling that won’t excite players chasing the huge multipliers newer Megaways releases can offer.

King of Slots™ RTP, Payout & Specs

King of Slots™ Bonus Features & How They Work

Wild Substitution

A blue sapphire icon fills the Wild role across the 15 reels, standing in for any regular symbol on the paytable except the Scatter. That substitution is built to work in your favor: the game always slots the Wild into whichever position completes the highest-value combination available, rather than the first line it could technically finish.

Sticky Win™ Feature

Once a spin lands a winning combination, the symbols responsible lock in place and every other reel respins around them. Any fresh win from that respin gets locked in too, and the cycle repeats for as long as new combinations keep landing. The moment a respin comes back with nothing new, the mode closes out and every locked-in win from the sequence pays out at once. Visual cues make it clear whenever this chain is active, so you always know a bigger payout might still be building.

Scatters and Free Spins

Five or more Scatter symbols landing anywhere on the reels in a single spin is all it takes to open Free Spins, played at the same bet level that triggered them. A running counter tracks how many spins remain, and every line win during the round pays out at three times its normal value. Landing five or more Scatters again mid-round adds another batch of spins on top of what’s left. Once the round finishes, a summary screen totals up everything won before play returns to the base game.

King of Slots™ FAQ