Koi Princess Slot Review

Expert Rating: 4 out of 5
Review by Chris Taylor
Last update 13th April 2022
Review by Chris Taylor
Last update 13th April 2022

Take a virtual trip to Asia in the Koi Princess slot, a feature-filled game from NetEnt. Released in 2015, this 5 reel, 20 payline game has become a firm favourite with slot players who have been attracted by the anime-style design and a total of 9 bonus features. On any spin, you could benefit from a Random feature that includes added wilds, a 5-of-a-kind win, wild reels or a bonus trigger. The main bonus features offer sure win free spins, free spins with wild reels, a guaranteed coin win or a spin of the bonus wheel. Increase your stake via the Bonus Bet to boost your chances of landing a feature. Find out everything else this slot has to offer in our full Koi Princess review.

Koi Princess Max Win
1,000 x bet
Type of Slot
Video Slot
Stakes Range
10p to £100
Bonus Features
Yes (9)
Free Spins/Multiplier
Max Win
1,000 x

Koi Princess Demo

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Koi Princess Slot RTP, Details & Wager Limits

Reels/Paylines: 5 reels + 20 paylines

Stakes Range: 20p to £100 per spin

RTP: 96.23%

Max Win: 1,000 x stake per spin

The Koi Princess slot is played on a standard 5 reel, 3 row, 20 payline machine. Create a winner by landing 3 or more matching symbols or wilds across a payline from left to right, starting from reel 1.

Stake levels range from 20p to £100 per spin. If you activate the Bonus Bet, your stake doubles up to £200 per spin. As with all NetEnt slots, changing your stake is simple to do; simply use the arrows below the reels to change the bet level and coin value.

The Koi Princess RTP is 96.23% which is slightly better than average. Excluding the Bonus Bet element, the RTP is actually 96%. The volatility sits in the medium range, which is what we’d expect here.

The hit frequency rate is 28.74% meaning that just over a quarter of spins will result in a winning combination.

When it comes to payouts, the max win is 1,000 x your total stake per spin. Your best chance of landing this is during the Bonus Wheel feature where multipliers can lead you to the top prize.

Theme – inspired by Asian pop culture

Theme: Asian

High Value Symbol: Wild

Compatibility: Mobile, Tablet, Desktop


It might be getting rather old but the design in the Koi Princess slot game has certainly stood the test of time. This is a very appealing game in terms of sound and visuals. Inspired by Asian pop culture, your aim is to spin with the fishes and find your fortune. ‘Koi’ is another world for affection or love in Japanese so has a love theme.

There’s a traditional feel to the imagery here which is very nicely done. Likewise, the orchestral soundtrack. This is a lovely looking slot. Set against a backdrop of waterfalls with a traditional temple in the distance, the reels are watched over by the anime-style Koi Princess of the title.

The reels are made up of Asian-style A to 10 royals which appear alongside coins, frog and dragon symbols. The Koi Princess is the most rewarding standard symbol, paying 20 x your total stake if you land 5 on a payline.

There’s also a wild that replaces all the standard symbols. Land 5 of these on a payline for a payout of 25 x stake.

Symbol Payout
koi-princess-slot-10-symbol10 3, 4 or 5 = 0.25, 1 or 5 x stake
koi-princess-slot-j-symbolJ 3, 4 or 5 = 0.25, 1.25 or 5.5 x stake
koi-princess-slot-q-symbolQ 3, 4 or 5 = 0.25, 1.5 or 6 x stake
koi-princess-slot-k-symbolK 3, 4 or 5 = 0.5, 2 or 7 x stake
koi-princess-slot-a-symbolA 3, 4 or 5 = 0.5, 2.5 or 8 x stake
koi-princess-slot-coins-symbolCoins 3, 4 or 5 = 1, 3.75 or 10 x stake
koi-princess-slot-frog-symbolFrog 3, 4 or 5 = 1, 5 or 12.5 x stake
koi-princess-slot-dragon-symbolDragon 3, 4 or 5 = 1.5, 7.5 or 15 x stake
koi-princess-slot-koi-princess-symbolKoi Princess 2, 3, 4 or 5 = 0.1, 2, 10 or 20 x stake
koi-princess-slot-wild-symbolWild Substitutes all symbols + pays up to 25 x
koi-princess-slot-bonus-symbolBonus Scatter 3 triggers 1 spin with 1 Bonus Feature awarded

Koi Princess Mobile


You can join the Koi Princess on tablets and smartphones as well as desktop devices. You’ll find the classy design and wide range of extras in the Koi Princess mobile slot.

Koi Princess Bonus Features

Rather unusually for a NetEnt slot that dates back to 2015, there’s a massive variety of gameplay on offer in the Koi Princess slot game. With 9 bonus features in total, there are 4 Random Bonuses that can trigger on any spin as well as 4 more triggered features.

Bonus Bet feature

The first decision to make is whether to activate the Bonus Bet feature. This doubles the cost of each spin. At minimum stakes, it’s 20p per spin. At max stakes, it’s £200 per spin. In return, the probability of landing a random or triggered feature increases.

Random features


On any spin, you could trigger 1 of 4 Random features. You’ll then get to choose from 3 Koi carp which will reveal one of the following bonus features:

  • 5-Hit Random feature: get this feature and you’re guaranteed to land a 5-of-a-kind win on the spin that follows.
  • Random Wild Random feature: 1 spin is awarded, complete with between 4 and 9 added overlay wilds. A payout calculation is made with the wild in position.
  • Wild Reels Random feature: on your 1 spin, between 2 and 5 reels will be filled with wilds to boost your chances of landing a big score.
  • Bonus Activation Random feature: pick this one and you’ll advance to the main bonus round and play one of the triggered features.

Bonus features


The Bonus features are triggered by landing the scatter symbol on reels 1, 3 and 5 on the same spin. Land just 2 scatters and you could benefit from a nudge that shifts the all-important third scatter into place. Which of the quartet of features you’ll play is randomly chosen. Here’s what they offer:

Feature Name Feature Info
Sure Win Free Spins This awards 10 free spins. You’re guaranteed to land a winning combination worth at least the same as the largest amount won during the free spins. During the first 5 free spins, 1 overlay is added to reels 1, 2 or 3. On the final 5 free spins, an extra wild appears randomly on reels 3, 4 or 5.
Wild Reels Free Spins 10 free spins are awarded. On each of them, between 1 and 5 reels will be filled with wilds.
Coin Win This bonus pays out a cash bonus of between 15 and 30 x your total stake.
Bonus Wheel Boost a payout by between 1 and 5 x if you land on a multiplier. You can also double the multiplier values. If the pointer lands on an arrow, you’ll advance a step closer to the centre of the wheel where prizes up to 1,000 x await.

Koi Princess Review Summary – easy to see why this is so popular

Theme & Symbols

Sounds & Music

Bonus Features

RTP (96.07%)

Max Win (1,000 x)


This virtual trip east is finely crafted. The sound and visuals are very impressive, even factoring in the Koi Princess slot’s age.  If you like plenty of variety from your gameplay, you won’t be disappointed either. With 9 bonus features in total, there’s plenty going on here courtesy of the random features and the triggered bonus rounds.

With 1,000 x stake wins, the Bonus Wheel feature is your best bet when looking for bumper payouts. The Wild Reels Free Spins feature is my favourite as you can land up to 5 reels per free spin. Achieve this to win 500 x your stake. Put the design and gameplay together and it’s clear to see why Koi Princess has become such a popular slot.

If it’s bonus features you’re after, San Quentin from Nolimit City has 5 as well as potential wins of 150,000 x stake per spin. Another is the Age of the Gods slot by Playtech which comes with 6 as well as 4 progressive jackpots and wins of up to 50,000 x stake on each Athena free spin.

Sticking with the theme, Quickspin’s Sakura Fortune 2 is one to try. With 5 reels and 576 paylines, the max win potential is pretty big at 19,644.8 x your stake and it comes with some fun respins and free spins features.

  • Tons of bonus features
  • Medium volatility
  • Good experience on mobile
  • Low max win

Koi Princess FAQs

What is the Koi Princess RTP?

The Koi Princess RTP rate is 96.23% which is slightly better than average. This is if you use the Bonus Bet feature. Without it, the RTP is still a respectable 96% and the hit frequency is a solid 28.74%.

What is the Koi Princess max win?

The maximum win in Koi Princess is 1,000 x your total stake. This can be won in the Bonus Wheel feature by getting to the centre of the wheel. On each spin or free spin, up to 500 x stake is up for grabs.

Are they any Koi Princess free spins?

Yes, Koi Princess comes with 2 free spins features. Both offer 10 free spins, the Sure Win Free Spins feature guarantees you’ll land a win on each of them. In the Wild Reels Free Spins feature, up to 5 wild reels appear on each free spin.

What do the Random features offer?

There are 4 Random features. They give you 5-of-a-king wins, overlay wilds, wild reels or entry to the main bonus features. Here, there are 4 more to play.

Is there a Koi Princess demo?

Yes, the Koi Princess free demo is available here at Online-Slot.co.uk. Enjoy testing out the slot on mobile, tablet and desktop.