King of Kings (Relax Gaming) Slot Review

King of Kings (Relax Gaming): Slot Overview 

King of Kings by Relax Gaming is the developer’s entry into the ever-popular “Book of” slot subgenre—a space dominated by classics like Book of Dead and Book of Ra. If you’re already familiar with the genre’s mechanics, this title won’t surprise you much. However, Relax tries to stir the ancient sands a bit with a few subtle twists, including a Bonus Symbol Re-Spin and a six-reel expansion during free spins. 

With a 5-reel, 3-row layout and just 5 fixed paylines, King of Kings keeps things lean. The game operates at high volatility (5/5) and offers a respectable RTP of 96.25%, along with a potential max win of 5,000x your stake—though wins beyond 10,000x have reportedly been hit, adding mystique to the potential payout cap. 

While it may not radically redefine the genre, King of Kings does enough to warrant a look, especially for fans of Egyptian-themed slots and straightforward, high-risk gameplay.

Design and Graphics 

The game leans heavily on classic Egyptian aesthetics. You’ll be greeted by golden statues of Horus flanking either side of the reels, set within an open-air oasis temple. In the distance, sand dunes and a pyramid reinforce the theme. The color palette is rich with golds, greens, and deep blues, all rendered in sharp clarity.The game layout is borderless, a nice visual touch that makes the reels float seamlessly within the temple frame. It’s a small but welcome change that differentiates King of Kings from its more rigidly framed genre counterparts. 

Symbol-wise, you’ll find a mix of lower-value scarab gems in blue, green, yellow, and red, along with higher-paying symbols representing Egyptian gods like Bastet, Anubis, and Horus. The top symbol is a stylized cartoon version of Tutankhamun, which pays 200x for five on a payline. 

Then there’s the golden Ankh, which acts as both wild and scatter, capable of triggering the bonus feature while substituting for any symbol to complete wins.

Gameplay Mechanics 

The mechanics of King of Kings are straightforward and rooted in classic slot design. You spin the 5×3 reel set, aiming to land matching symbols across 5 paylines. That’s a notably smaller number than the standard 10 or 20 paylines offered by similar titles, and while it simplifies gameplay, it also limits win frequency. 

What sets King of Kings apart are its two main mechanics: 

Bonus Symbol Re-Spin 

Expanded Free Spins 

Bonus Symbol Re-Spin 

This is a base game bonus that triggers when you land two scatter symbols—one short of the usual three needed to unlock free spins. When this happens, you get 1 free spin, with one of the symbols chosen as a randomly expanding bonus symbol, just like in the full bonus round. 

If that symbol expands and covers all five reels, it can result in a full-screen win, paying up to 1,000x your stake—a substantial reward for what is essentially a consolation spin.

Sound and Music 

The audio in King of Kings is suitably cinematic, featuring traditional Middle Eastern motifs blended with ambient orchestral elements. You’ll hear subtle chimes, temple echoes, and ominous drums building tension as you spin. When the reels stop or a big win hits, the sounds shift into celebratory tones, with resonant harp and horn effects. 

It doesn’t break any new ground, but the soundtrack is cohesive and atmospheric, perfectly supporting the game’s ancient Egyptian theme. It’s immersive without being intrusive.

Bonus Features 

Free SpinsThe core bonus feature in King of Kings activates when you land 3 or more wild/scatter symbols. This awards 10 free spins, and with it, a significant change—the game expands to 6 reels instead of 5. This opens up more opportunities for symbol combinations while retaining the same 3-row format. 

During the free spins: 

One symbol is randomly chosen to become the expanding special symbol. 

When this symbol lands in the right count (3 lows or 2 premiums), it expands across its reel. 

The expansion does not require adjacent positioning to pay, adding significant potential to each spin. 

With 6 reels in play, the possible payout jumps to 5,000x your stake, although Relax Gaming notes that simulated wins over 10,000x have occurred—adding a high-stakes edge to the otherwise familiar gameplay. 

The expanded reel set and generous symbol payouts make this feature the highlight of the game, bringing tangible excitement to a well-worn mechanic.

Betting Options and Payouts 

King of Kings caters to both budget-conscious players and high rollers with a betting range from €0.10 to €50 per spin. 

Key stats: 

Reels/Rows: 5×3 (6 reels in bonus) 

Paylines: 5 

RTP: 96.25% 

Volatility: High (5/5) 

Hit Frequency: 18.88% 

Max Win: 5,000x (but simulated wins over 10,000x exist) 

Min/Max Bet: €0.10 / €50 

The Hit Frequency is low, which means wins won’t occur too often, but they have the potential to be significant. This suits the high-volatility nature of the slot, where dry spells are common but rewarding bursts are possible. 

Symbol payouts are also notable: 

Tutankhamun symbol: 200x for 5 on a payline. 

Golden Ankh wild/scatter: Pays 2x, 20x, 200x, or 1,000x for 2, 3, 4, or 5 respectively.

Conclusion 

King of Kings is a slot that doesn’t attempt to reinvent the wheel—but it does polish it. While it closely follows the footsteps of other “Book of” style games, it differentiates itself with a Bonus Symbol Re-Spin, an expanded 6-reel free spins mode, and a max win potential that exceeds its advertised cap. 

However, with only 5 paylines, the base game can feel a little dry, and the 6th reel in free spins—while visually appealing—may seem like a gimmick more than a substantial gameplay changer. It’s also clear that much of the design and structure leans heavily on tried-and-tested tropes, which might underwhelm those craving innovation. 

That said, for players who appreciate straightforward, high-volatility slots with the chance for massive rewards, King of Kings does its job well. It plays quickly, offers decent excitement during its feature rounds, and wraps it all in classic, colorful Egyptian flair.