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We evaluate slot machines based on multiple criteria, from which we make our final verdict.
Design and theme
85 %
Features and playability
80 %
RTP and volatility
96 %
Slot machine details and review Ninja
Endorphinaβs Ninja is a slot that has one of those themes that most male players will likely appreciate seeing, its inspiration coming from Japanβs assassins in the countryβs medieval period. Itβs an Orient-themed slot machine that gives you 5×3 reels each round, while its winning combinations may form via 20 paylines.
Every slot machine must be developed by a company that invented, designed and put it into operation. Many players eventually find that they only enjoy playing on machines from specific software provider, so they narrow down their selection by preferred brand.
A high volatility slot. Wins are rare, but can be really big. The game has more pronounced fluctuations and can often go without hitting anything for a long time, suitable for players who like adrenaline, higher risk and work with a larger budget. More about volatility here.
Slot theme and symbols
While a lot of other Endorphina slots use filler symbols such as Royals or card suits, in Ninja, we find that all 7 regular symbols offered are themed. Youβre looking either at ninjas in suits of different colours, or at their specialized weapons (shuriken, nunchaku, etc). Quality-wise, itβs also doing a pretty good job, so if youβre the sort of player who cares about looks as well, this one does a good job at it.
Ninja theme and symbols
The slotβs demo should give you an idea of how it plays out, but for now, suffice it to say that itβs a High volatility release, where considerable risk should be expected (plenty of losing spins, though with a small chance at a big prize from time to time). The 5,555x top jackpot is an adequate reward in a risky slot machine with five reels, especially since the announced RTP is 96.02%.
Blue Ninja
Red Ninja
Yellow Ninja
Nunchaku
Shuriken
Throwing Darts
Hand Claws
Special Symbols and Slot Features
3D
NO
Autoplay
YES
Free Spins
YES
Gamble Feature
YES
Locking Symbols
NO
Wild Symbol
YES
Win Multiplier
YES
Other features
Bonus buy
Other Features
Scatter Symbol
Symbol collection
WILD symbol
The Black Ninja is the slotβs wild symbol, which may land on all reels, acting as a substitute for regular symbols of all types.
Wild Accumulator
Whenever there are 2, 3, 4, or 5 Black Ninjas on the reels at the same time, the game will collect them, giving you 2, 5, 30, or 100 wilds in the accumulator. You refill this Wild Accumulator as youβre playing through paid spins, and you get to use them during the free spins. The bet level is associated with the wilds accumulated there, and if you change the amount wagered, you start over with a different accumulator. Go back to the original bet, and the accumulated wilds will be there, waiting for you.
Free Spins
The Black Ninja will also act as a scatter symbol, being used to trigger the free spins feature. You need 3+ Black Ninja symbols around to get there. The game will start adding wild symbols to the reels, from those youβve accumulated, until you run out. At that point, the free spins will end. You can get a regular wild when the Black Ninja is added to a weapon symbol, or a 2x multiplier wild if itβs added on top of a high-paying ninja symbol. You can have several multiplier wilds in a combo, with boosts of up to 8x possible as a result.
Risk Game (Gamble)
A regular card game is used as the gambling option in Ninja. You just have to be willing to risk the spinsβ winnings and select the appropriate button to get there. You will then have to win the feature by picking a card thatβs higher than the one the dealer gets. Otherwise, you lose the roundβs winnings. As a winner, you double the prize.
Bonus Pop Buy
If you want immediate access to the free spins feature, you can get there by paying to use the Bonus Pop option. You either pay 190x the stake for a free spins feature with 50 accumulated wilds, or 366x for the version with 100 wilds.
Prize table
Symbol
Multiplier
3x in payline
4x in payline
5x in payline
Blue Ninja
5x
25x
250x
Red Ninja
1x
3.75x
37.50x
Yellow Ninja
0.75x
2.50x
25x
Nunchaku
0.25x
1.50x
10x
Shuriken
0.25x
1x
5x
Throwing Darts
0.25x
0.75x
3.75x
Hand Claws
0.25x
0.75x
3.75x
Our rating of the game
Ninja
Ninja has the right graphics and a theme that many players will love seeing, given the coolness factor that these Japanese warriors tend to have. While the volatility of the slot is mentioned as High, this is one of those cases where the reward is at a level thatβs worth it, up to 5,555x the stake being paid by its best spins. A 96.02% RTP was announced for this game. Thanks to its high volatility, Iβd recommend this game to more experienced players.
90%
Editor's rating
Design and theme
90 %
90 %
Features and playability
85 %
85 %
RTP and volatility
96 %
96 %
How do we rate slot machines?
We evaluate slot machines based on multiple criteria, from which we make our final verdict.
A 5,555x top jackpot is the ultimate reward that players can expect from this game.
A 96.02% RTP is good enough in the case of a slot machine.
A cool ninja-themed design that has only story-appropriate symbols on the reels.
Black Ninja Wilds are accumulated as you play, to use during the free spins.
A free spins feature that lasts for as long as it takes you to get all accumulated wilds back.
There are two different options in the Bonus Pop Buy section to buy access to the free spins.
Cons
It has high volatility, so while it does some things right, it is also risky to play.
While theyβre designed differently, what you get is a basic mix of wild symbols and free spins.
The Risk Game has an RTP of 84%, so itβs even lower than that of the game.
Manufacturer Endorphina
Endorphina is a Prague-based online casino software developer founded in 2012, known for creating visually stunning and mathematically balanced slot games. π° The company combines classic slot mechanics with innovative features and engaging storylines, appealing to both traditional and modern players. Endorphinaβs portfolio includes popular titles like Book of Vlad, Hell Hot 100, and Chance Machine 40, all designed in HTML5 for seamless play across devices. Licensed and regulated by reputable authorities, Endorphina continues to stand out in the iGaming world for its creativity, reliability, and focus on player experience.
The overall bonus rating is determined based on several factors: the amount of the bonus, the company's rating, the ease of obtaining it, the players' rating and the conditions for obtaining the bonus.
18+. New Players Only. Β£10 minimum deposit. 100% up to a maximum of Β£200. The welcome offer can be activated only once. 30 calendar days to activate. 35x wagering. 60 calendar days from activation to complete wagering. The 100% bonus up to Β£200 will be paid out in 10% increments to your Main Account balance. Bonus balance is not payable. Any remaining bonus balance will be forfeited upon withdrawal. T&Cs Apply. GambleAware.org
The overall bonus rating is determined based on several factors: the amount of the bonus, the company's rating, the ease of obtaining it, the players' rating and the conditions for obtaining the bonus.
18+. New players only. Min dep. Β£20. Valid for 14 days from registration. Welcome Offer: Earn points for cash bets made to unlock wager-free spins on selected games: 2 points for every Β£10 bet on Slots, 1 point for every Β£10 bet on Video Poker and qualifying Side Bets. 0.25 points for every Β£10 bet on Roulette games. Maximum accumulation of redeemable points is limited to 2000. You will receive spins based on the number of points earned:10, 20, 35, 50 points = 5 spins, 70 points = 1 Superspin, 100 points = 10 spins, 200 points = 5 Superspins, 300 points = 4 Superspins, 500 points = 6 Superspins. Additionally you will earn an extra 120 Spins for every 375 points earned above the 500-point threshold, until you reach a total of 2000 points. Spins credited the next day. Spin winnings credited as cash funds and capped at Β£100 per batch of spins. Cash funds are immediately withdrawable. Wager-free spins must be used within 72 hours. Terms Apply. BeGambleAware.org.
Warning: Play and gamble responsibly | Gambling may be addictive 18+ | Underage gambling is an offence | When the fun stops, stop.
I am a writer who specializes in slot machines. I've been writing about them since 2013 and have reviewed thousands of slot machines over the years. I continue to cover the industry and review new releases for Bonusmenu. When I'm off the clock, you'll find me buried in a book or wandering the virtual wastelands of Fallout and the provinces of The Elder Scrolls.
18+. New Players Only. Β£10 minimum deposit. 100% up to a maximum of Β£200. The welcome offer can be activated only once. 30 calendar days to activate. 35x wagering. 60 calendar days from activation to complete wagering. The 100% bonus up to Β£200 will be paid out in 10% increments to your Main Account balance. Bonus balance is not payable. Any remaining bonus balance will be forfeited upon withdrawal. T&Cs Apply. GambleAware.org
18+. New players only. Min dep. Β£20. Valid for 14 days from registration. Welcome Offer: Earn points for cash bets made to unlock wager-free spins on selected games: 2 points for every Β£10 bet on Slots, 1 point for every Β£10 bet on Video Poker and qualifying Side Bets. 0.25 points for every Β£10 bet on Roulette games. Maximum accumulation of redeemable points is limited to 2000. You will receive spins based on the number of points earned:10, 20, 35, 50 points = 5 spins, 70 points = 1 Superspin, 100 points = 10 spins, 200 points = 5 Superspins, 300 points = 4 Superspins, 500 points = 6 Superspins. Additionally you will earn an extra 120 Spins for every 375 points earned above the 500-point threshold, until you reach a total of 2000 points. Spins credited the next day. Spin winnings credited as cash funds and capped at Β£100 per batch of spins. Cash funds are immediately withdrawable. Wager-free spins must be used within 72 hours. Terms Apply. BeGambleAware.org.
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Software provider
Game typeSlot
Reels
Winning paylines20 paylines
