About Koi Princess Slot
Koi Princess is an anime-themed slot by NetEnt. It has a 5x3 grid, 20 fixed paylines, and many bonus features.
At any point in the base game, a Random Feature can trigger. There are four possible outcomes and all of them give wins. This makes the slot stand out from most games of its time.
Bonus Bet mode doubles the spin cost. In return, bonus features trigger more often and RTP goes up to 96.23%. The main goal in Koi Princess is to reach the Bonus Wheel. Everything else in the game leads to it.
Japanese Theme and Anime Aesthetic
The game draws on Japanese mythology around the koi carp and its imperial associations. Lotus motifs, lantern-lit water backgrounds and ceremonial audio give the base game a composed, ornamental quality that holds up well.
The anime-looking Princess leads the premium symbol set alongside a lion, frog, coin symbols and standard card royals.
When you win big, the Princess screams "わーお!おめでとう!" which in English means "Wow! Congratulations!". Honestly, it is an awesome detail.
RTP, Volatility and Max Win Probability
Standard RTP is 96.00%, rising to 96.23% with Bonus Bet active.
That is one of the cleaner RTP uplift cases in NetEnt's catalogue – the premium mode genuinely improves the return rather than simply increasing cost without mechanical benefit.
Max prize probability is 0.033167%. Volatility is medium-high overall. The base game runs relatively quietly between Random Feature triggers.
Bonus Bet Mode
Activating Bonus Bet doubles the cost of every spin. It is the most significant decision you make in Koi Princess slot.
In return: higher probability of Random Features triggering in the base game, higher probability of Bonus symbols landing to reach the Bonus Feature Wheel, adjusted multiplier values on the wheel, increased Sure Win amounts during Sure Win Free Spins, and a raised RTP of 96.23% versus 96.00% on standard play.
The maths are relatively straightforward. If your bankroll supports double stakes, Bonus Bet is the preferred mode for anyone targeting the feature set. Standard play still accesses every feature – just less frequently.
Random Features
Random Features trigger spontaneously on any base game spin – no symbols required. When one activates, three sealed options appear on screen and you pick one to reveal the outcome.
The feature behind each option is drawn from a pool of four:
| Feature | Description |
|---|---|
 |
Guaranteed five-of-a-kind win on a random payline |
 |
4 to 9 overlay Wilds placed at random positions |
 |
2 to 5 entire reels converted to overlay Wilds |
 |
Guarantees three Bonus symbols, triggers Bonus Feature |
All four outcomes deliver a win of some kind. Bonus Activation is the most valuable by a considerable margin.
Bonus Feature Wheel
The Bonus Feature Wheel is one of the bonuses that activates when three Bonus symbols land simultaneously on reels 1, 3 and 5 – or via a Nudge or Bonus Activation Random Feature.
Once active, you spin the wheel and progress through a three-tier board game. Move forward via dice rolls, collect 2x–5x multiplier values along the path, and land on Double Up spaces to increase accumulated values. The board game structure means outcomes build progressively – each roll adds to what came before.
The Jackpot Coin Win sits at the board's centre and awards a random multiplier between 25x and 250x bet – the highest single payout the game offers. The NetEnt team built the Bonus Wheel as a three-tier structure precisely to create this sense of progression toward that central prize.
Bonus Features
Four possible outcomes from the Bonus Feature Wheel. Two are free spin modes, two are instant-win variants. Bonus Bet influences both the probability of reaching the wheel and the values available once you are on it.
Sure Win Free Spins
10 free spins with a guaranteed minimum win floor on every spin – each spin pays at least the current Sure Win amount regardless of what the reels produce.
Landing Bonus symbols during the feature increases the Sure Win floor and awards additional spins. Bonus Bet raises the Sure Win amounts throughout.
The guaranteed-win-per-spin structure makes this the more consistent of the two free spin modes. Lower ceiling, but nothing is wasted – every spin contributes to the total.
Wild Reels Free Spins
10 free spins where every spin includes 1 to 5 reels covered entirely by overlay Wilds. The wild reel count varies per spin.
At maximum coverage – five wild reels – only Bonus symbols break the blanket. That is where the largest wins in Koi Princess free spins concentrate.
Floor spins with a single wild reel are considerably quieter. Variance within the feature itself is high. This is the mode for players comfortable with swings in exchange for a higher ceiling.
Coin Win and Jackpot Coin Win
Coin Win is an instant payout: current bet multiplied by a random value between 10x and 30x. No spins, no board progression – collected and done.
Jackpot Coin Win sits at the centre of the Bonus Wheel board. It pays a random multiplier between 25x and 250x bet – the top-end 250x is the largest single-moment payout available in the game. Both outcomes bypass the free spin structure entirely and pay immediately.
Paytable in Koi Princess
20 fixed paylines pay left to right from reel 1. Only the highest win per payline is paid. Wild substitutes for all symbols except Bonus. Bonus symbols trigger the feature when landing simultaneously on reels 1, 3 and 5.
Paytable values below are in coins – multiply by your coin value for GBP payout. Use the in-game paytable for current £ values at your configured bet.
| Symbol | 2x | 3x | 4x | 5x |
|---|---|---|---|---|
 |
4 | 100 | 300 | 500 |
 |
2 | 40 | 200 | 400 |
 |
– | 30 | 150 | 300 |
 |
– | 20 | 100 | 250 |
 |
– | 20 | 75 | 200 |
 |
– | 10 | 50 | 160 |
 |
– | 10 | 40 | 140 |
 |
– | 5 | 30 | 120 |
 |
– | 5 | 25 | 110 |
 |
– | 5 | 20 | 100 |
How to Start Playing the Slot
Find a UKGC-licensed casino offering Koi Princess NetEnt titles
Choose a regulated UK operator with a valid UKGC licence that carries NetEnt in their library.
Register and verify your account
Submit your details and complete identity verification. UK operators require KYC checks before you can withdraw winnings.
Deposit in GBP
Fund your account using a supported payment method. Most UK casinos accept debit cards and major e-wallets such as PayPal or Skrill. Credit cards cannot be used for gambling transactions at UKGC-licensed operators.
Find Koi Princess slot in the lobby or NetEnt section
Search by name or filter by NetEnt in the provider list. The koi and lotus artwork on the tile makes it easy to spot.
Set your bet and decide whether to activate Bonus Bet
Adjust your stake between £0.20 and £200.00. Consider enabling Bonus Bet if your bankroll supports double stakes – it meaningfully raises feature frequency and RTP.
Spin and interact with any Random Features or Bonus Wheel that triggers
When a Random Feature activates, pick one of the three sealed options. When Bonus symbols land on reels 1, 3 and 5, the Bonus Wheel launches – spin it and follow the board game.
About NetEnt
Swedish studio founded in 1996 and one of the longest-established names in online slots. Koi Princess sits alongside their interactive-era catalogue that includes Gonzo's Quest, Starburst and Dead or Alive.
Acquired by Evolution in 2020 and continuing to operate under the NetEnt brand. UKGC-licensed and independently audited by eCOGRA, whose testing lab is based in London. Classic NetEnt polish applied to a genuinely layered feature set – Koi Princess is a good example of what the studio was doing when player interactivity was central to their design thinking.
Screenshots
FAQ
Bonus Bet doubles the cost of every spin. In return it raises the probability of Random Features triggering during the base game, increases the likelihood of Bonus symbols landing on reels 1, 3 and 5 to reach the Bonus Wheel, adjusts the multiplier values available on the wheel itself, increases Sure Win amounts during Sure Win Free Spins, and raises the RTP from 96.00% to 96.23%. If your bankroll supports double stakes, Bonus Bet is the more efficient mode for targeting the feature set.
The Bonus Feature Wheel activates when three Bonus symbols land simultaneously on reels 1, 3 and 5, or via a Nudge or Bonus Activation Random Feature. Once active, you spin the wheel and progress through a three-tier board game: move forward via dice rolls, collect 2x–5x multipliers along the path, and land on Double Up spaces to increase accumulated values. The four possible outcomes are: Sure Win Free Spins (10 spins with a guaranteed win floor each spin), Wild Reels Free Spins (10 spins with 1–5 full wild reels per spin), an instant Coin Win at 10x–30x bet, or the Jackpot Coin Win at the board centre paying 25x–250x bet.
Sure Win Free Spins awards 10 spins where every spin pays at least the current Sure Win floor amount regardless of the reel result. Landing Bonus symbols during the feature raises the floor and adds spins. It is the consistent, lower-variance mode. Wild Reels Free Spins also awards 10 spins, but each spin has between 1 and 5 full reels converted to overlay Wilds. The variance within the feature is high: a spin with five wild reels against premium symbols produces the largest wins in the game, while a spin with one wild reel can be quiet. Wild Reels Free Spins is the higher-ceiling mode.
Random Features trigger spontaneously on any base game spin – no symbols are required to land. When one activates, three sealed options appear on screen and you pick one to reveal the outcome. The feature behind each option is drawn from a pool of four: 5-Hit (guaranteed five-of-a-kind win), Random Wilds (4–9 overlay Wilds placed randomly), Wild Reels (2–5 full wild reels for one spin), or Bonus Activation (guarantees three Bonus symbols land on reels 1, 3 and 5). The pick is a player interaction but the outcomes are randomised – you cannot know which feature is behind which option.
The Jackpot Coin Win sits at the centre of the Bonus Feature Wheel board. Reaching it awards an instant random multiplier between 25x and 250x your total bet. At the top end this is the largest single-moment payout available in Koi Princess – the max prize probability sits at 0.033167%. It is an instant payout with no free spins involved. The Coin Win (non-jackpot) is a separate outcome from the wheel paying 10x–30x bet.