User rating5 / 5

King of Slots slot from NetEnt

King of Slots slot from NetEnt
In 2015 - 5 years after releasing the Jack Hammer slot, NetEnt produced a clone of the widely popular slot, titled King of Slots. It seems this resulted from a project for one special casino but later became attainable for the mass public. The name implies the game theme - royalty, although it is not entirely clear the story behind this luxury concept. In this game, the Swedish studio shows us unity between random characters and symbols - goofy old king, royal attributes, and ornamented with gold fruits, gems, and letters. All this emerges one not super exciting, but still decent game with cloned overall elements and gameplay. 

The replica has low volatility, the same RTP (of 96.96%), the same 3x5 grid, 25 pay lines, and 15 independent reels, plus naturally retains the same maximum winning per single spin (of 750 000 coins) as the original slot.

You can practice the King of Slots for free via the link on our site. No logins or downloads are needed.

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Personal testers’ opinion about King of Slots slot

From the beginning of your session, you will immediately be convinced that this is a complete copy of Jack Hammer, just with a different topic and modernized graphics.

  • It resembles the Hammer slot also by its low volatility and the short cycle, i.e. good for players with a small budget because it involves fewer risks, and you can extend your gameplay with small but frequent wins.
  • The wagering rating for this game shows above index 6, which suggests that completion of the bonus requirements is very much workable.
  • The Free Spins bonus round is triggered statistically, every 181st spin (0.55%).

NetEnt wanted to realize this ambitious project. Instead of making a new and interesting game with a long cycle and super huge winnings, which could have kept the players’ interest for long years, the game developers created one inferior clone. Despite the high RTP, they managed to create a lower-rank game when trying to replicate one fine and popular original slot. From the theoretical 96.96% RTP, the developer chooses to leave only 19.7% for payouts in the bonus round, which is an insufficient number in our opinion, so no point in chasing the Free Spins.

Review and recommendations by the testing team

  • As we specified already, King of Slots is Jack Hammer slot's clone- with the same paytable and game features.
  • In the usual spins, the slot doesn’t struggle much and successfully keeps the balance, despite the small payouts for the winning combinations, which helps while waiting for matching expensive symbols to drop on the five reels or for a bonus game.
  • Triggering the Free Spins doesn’t happen frequently, and once they are regularly initiated, they deliver low-value symbol combinations. On the other hand, the slot can generate good payouts even with cheap symbols during the Re-spins, up to a full grid with the same figures, which is fantastic if it happens several times in a row. The average payout of the bonus game that our team registered during the tests was 60x - 120x total bets. 

NetEnt declares the following probabilities

  • The theoretical RTP indicator is plenty high and can get up to 97%.
  • From these - 77.3% are reserved for payouts in the usual spins and 19.7% in the Free Spins.
  • The probability of getting any hit (winning) is 25.3%.

Hidden parameters and settings of King of Slots slot (data from testing)

  • The frequency of triggering of the bonus is the free spins feature - statistically every 181st spin (0,55%).
  • The probability of a hit (any winning) is 25,06%.
  • The winnings (total) distribution is 80% in the usual spins and 20% in the bonus free spins feature.
  • The maximum payout during the tests was 97x.
  • The average winning from the bonus was 17x.
  • Volatility is 4.6 out of 20 (low).
  • The cycle length is short.
  • The rating of the slot machine for the wagering is 6,09 out of 10.
  • RTP of 97% allows getting a positive mathematical expectation of winning at the casino.

Sticky Re-spin feature

The star feature of this machine (as with Jack Hammer) is the Sticky Wins Re-spins. They are enabled during both - main game and Free Spins. 3 + winning symbols are held in their initial place, while the rest of the symbols take a Re-spin. If a new winning symbol drops, it becomes sticky, and the next Re-spin is granted. This happens as long as more new winning figures appear. Once the Re-spins end, the full accumulated winning amount is rewarded at once. So, with this feature, in theory, 15 winning symbols can fill the screen immediately, giving the maximum win for that specific figure in the length of 1 spin (with 1 or multiple Re-spins).


  • Provider – NetEnt.
  • Number of reels - 5
  • Volatility is low.
  • Number of pay-lines - 25 (always active)
  • The value of a coin - from 0.01 to 1
  • Number of coins per spin - 1-10
  • Rates size range - from 0.25 to 250
  • Maximum winnings - x1000 (5 symbols of Golden Crown)
  • Wild symbol - yes (Blue Crystal)
  • Scatter - yes (Pink Crystal)
  • Free spins - yes (up to 30 free games with an x3 multiplier which will be started by Scatter symbol)
  • The additional feature - yes (Sticky Win)
  • The expected payout percentage (RTP) of the online slot is 96.96%.

How to win at the King of Slots slot machine? (Conclusion)

  • Our golden rule is: before playing with real capital to test the slot in DEMO mode (for free). 
  • King of Slots machine is suitable for both - playing with a bonus and with real money, but in relatively short sessions. The ultimate ‘king’s splendour’ here is the fact that slot players of all budgets can play with a stake that suits their current balance and enjoy all of the features to the fullest.
  • So, the best advice we can give is to put this slot in use for a short gamble and with stakes multiple of 10.
  • We established that the slot doesn’t agree much with max bet - so, be attentive and avoid stakes above 25 CAD per spin.
  • Play an initial maximum of 60 spins to verify the slot winnings frequency. If you are lucky, it can trigger the Free Spins for you. If the machine is not in a giving mood, it will be obvious from those first spins. In such circumstances (‘cold’ mood) is wise to move to another game.

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Written by Kamen Valev
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