User rating5 / 5

Koi Princess slot from NetEnt

Koi Princess slot from NetEnt
Koi is a fish. Koi is a fish in a pond. Koi is a fish in a pond in the middle of a water garden. This Koi in the pond in the middle of the water garden has siblings, and together all of them decorate the life of the little Japanese Princess, who is craftily drawn on the game canvas for us by NetEnt developer. Released in 2015, this slot with a 5x3 playfield 20 fixed pay lines is one extremely loved game with stunning graphics, amazing anime art style liveliness, and 10 (!) different features. 

Despite the general opinion that this is one ‘girlish’ slot, the Koi Princess slot is relished by players of all ages, genders, and types: bonus hunters, high and low rollers, beginners, and experts. All of them acknowledge the incredible job of art skill and game competence enliven into this slot by NetEnt! 

This slot has Medium Volatility with an RTP of 96%. The RTP allows obtaining a positive mathematical expectation of winning in the casino. If you would like to get to know this Princess and her profitable Manga-tricks, you can play on our page for free and without registration.

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Personal testers’ opinion about Koi Princess slot

  • Koi Princess is a slot with an abundance of bonus features, and most important, it triggers them often. The key feature which the player faces at the beginning of his game is the Bonus Bet option. You can activate it or reject it. The function doubles your winning probabilities, doubles your chances of triggering all the other features, but doubles your total bets per spin, too (i.e. double the cost/loss/trouble)!
  • The way to hit a massive win with the Koi Princess slot is quite extended and intricate. The paytable could’ve been slightly better, in our opinion - top symbol Wild holds 500 coins for 5OAK, so it’s worth mentioning that even a complete screen of Wilds holds a value of only x200 bet. But at least the Wild symbols are paid. Furthermore, 2xWild symbols and 2xPrincess symbols are both making a winning combination.
  • Undoubtedly the gameplay is well defined, with exciting and crisp animations, plus packed with more than enough bonus features. 
  • Through the process of testing, we spotted one kind of ‘glitch’ (***)in the machine while we had the Bonus Bet enabled - when the random koi feature appears to be triggered and then pushes back and doesn’t perform (like your eyes have been tricked). Instead of receiving a bonus feature, your game goes on with base spins. That is a sign that the slot is ‘cold,’ so you should exit the game.
  • The maximum prospect of winning holds the feature Sure Win Free Spins; if you are lucky enough to hit some super amount in the first spin, that will repeat until the end of the bonus round + anything more coming along the way.
  • It is theoretically analyzed that every 55th spin should consist of a bonus feature. So, if you count your rounds and the slot is underperforming by a lot, there is no reason to go on playing. It also means that it is ‘cold.’ And when it is cold, it remains like that for countless numbers of spins.

Review and recommendations by the testing team

Koi Princess is perhaps one of the most treasured slots among slot fans - not only NetEnt’s enthusiasts but overall online casino aficionados! 

It is one intelligent, propitious, and vivid slot. It is memorable for its many additional features in the usual spins and a whole set of bonus features as follows:

  • 1. Bonus Bet option.
  • 2. in the usual spins: Random Features: Nudge; Random Wilds; Wild Reels; 5-Hit; Bonus game activation.
  • 3. in the bonus round: Wild Reels Free Spins; Sure Win Free Spins; Coin Win; Bonus Wheel.

Never the less Koi Princess has one cheap paytable with low winning combinations and renders relatively low payouts. 

  • If you switch on the Bonus Bet, naturally, you get a higher RTP number and increased chances for Random Features and Bonus Features initiation. But just to remind you: the minimum of this ‘fishing expedition’ then will cost you not 0.20 cents per bet (at 0.01 coin), but 0.40 cents per bet (at the same 0.01 coin value).
  • During the base game, a balance increase on the pay line symbol combinations alone is not possible.
  • Your capital can only be kept by the Random features (named above). And we cannot deny these Random functions are very often triggered. This is the ground for the slot to be preferred and beloved.
  • The slot renders these Random features with different frequencies, either by literally triggering 1 every 10 spins or none in 100 spins.
  • With the 5-Hit and Random Wilds features, you should not anticipate one big win. Their values usually don’t go beyond 10x - 25x total bets, but the feature Wild Reels is pretty much capable of rewarding big winning of more than 100x bets.
  • Of all bonus options, the most exciting is the - Sure Win Free Spins feature. It depends on your luck, of course, but the potential of this feature is very high: If you lend a good combination during the first spins, then that winning amount will be attached to every next spin. In any other way, the winning of the Sure Win will be less than the win with the Coin Win.
  • Coin Win is one of the lesser choices. This function brings minimal winnings ranging from 10x to 30x bets.
  • The Wild Reels Free Spins feature can bring substantial winning from around 100x bets when randomly awards with 1 to 5 wild reels.
  • In theory, the Bonus Wheel is the best bonus feature because the rewards on the Wheel are about 20x - 100x total bets plus additional Free Spins, extra Random features, Jackpot Coin Win, or additional bets with multipliers. So the average winning from this bonus, in reality, is 40x - 80x total bets.
  • Summary: Despite the announcement by NetEnt 1000x Stake Wins, we believe the slot potential is not super big. The triggering frequency, we agree - luckily, is very high. That can be noticed from the beginning of the game session. If during the first 20-40 spins you don’t receive bonuses or random features, it is not advisable to continue playing. 
  • The slot is not the best NetEnt game for wagering, but if you test it and conceive it is in a ‘giving mood,’ you can go for it.

Hidden parameters and settings of the slot (data from testing)

  • The statistical number representing the frequency of triggering the bonus feature is every 55th spin (1.80%).
  • This is very profitable - meaning it happens 3 times more often than NetEnt’s middle line slots. However, this number was registered while the Bonus Bet feature was activated (i.e. during the ‘extra costly’ bets)
  • The probability of any winning (hit in general) is 26.80%.
  • The winning distribution is 54% of the winning pool during the usual spins and 46% of the winning pool during all bonus features together.
  • The maximum winning recorded during our tests was 500x, which is a decently high number for a Medium Volatility slot (variance index 5.51).
  • The average winning from the bonus feature reported by our team was just 25x the total bet.
  • Logically - the bonus features carry the highest potential of winning. The Sure Win Free Spins and the Bonus Wheel are the winners among the functions.
  • The wagering index for the machine is 5.95 out of 10. So if the slot is in the ‘hot’ mood, it is circling around the starting balance, which is good for covering the wagering requirements.
  • The RTP of the slot 96 % allows you to get a positive mathematical expectation of winning at the casino.


  • The number of reels is 5
  • The number of pay lines is 20 (always active)
  • The cost of one coin is from 0.01 to 1
  • The number of coins per line is from 1 to 10
  • The range of bet sizes ranges from 0.20 to 200
  • The maximum winning is x500 (five symbols wild)
  • Wild symbol - yes (Blue Wave)
  • Scatter - yes (Dragon)
  • Bonus free spins feature - yes (it is triggered with the help of the bonus game)
  • Bonus game - yes

How to win at the Koi Princess slot machine? (Conclusion)

  • To avoid slot 'headaches,' our main tip as always is to probe the game in a free (DEMO) version. 
  • We do not recommend this slot to players who want to win super big money.
  • It is advisable to play with Bonus Bet activated (if your budget allows it, of course) because the RTP is higher, doubles your winning prospects.
  • You can comprehend the cold ‘mood’ of the slot from the initial 20 to 40 spins - the hint is the lack of bonus features. 
  • Another clue about the slot mood is after you have the Bonus Bet activated, and the machine ‘cheats’- first grants, then retract the random koi feature (check above ***). 
  • If the Koi Princess slot exhibits both of these symptoms, we strongly recommend changing the game.
  • Different experts have different opinions about the bonus money wagering, but once you sense that the slot is ‘hot,’ you can successfully manage to beat the requirements. Of course, it will circle near the starting balance if it is in such a mood, from what the bonus hunters can profit. And if there is no enough action during the first spins - just exit the slot.

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Written by Kamen Valev
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