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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
85 %
RTP and volatility
96 %
Slot machine details and review Ultimate Crystals
Ultimate Crystals is an online slot from Czech developer Kajot Games that takes players into a futuristic space-mining setting for precious gems. The game blends classic elements with modern features, offering a fresh experience for slot fans. The slot is designed as a fairly classic machine with five reels, 3 rows and 10 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 slot with medium volatility. Wins occur occasionally and are balanced. The game has an alternating course without extreme fluctuations, suitable for players looking for a compromise between risk and winning potential. More about volatility here.
Slot theme and symbols
Ultimate Crystals stands out from classic fruit slots at first glance. Instead of cherries, lemons or bells, youβre met with a whole range of dazzling gemstones and stylised symbols like BAR or the number seven. The game evokes the feel of space mining or synthetic crystals, reinforced by effects and a futuristic vibe. The slotβs background is dark and understated so it doesnβt distract from the reels themselves, while still looking modern. The soundtrack is electronic, unobtrusive, and nicely complements the overall gameplay experience. The symbols are sharply rendered, the animations are smooth, and the overall impression is very professional β Kajot has shown a high standard of visual design here. The symbols have different payout values, with the most valuable combination being a line of red sevens and gold BARs. The key feature of the game is the WILD symbol in the form of a rainbow icon. When the WILD symbol appears, the Re-spin feature triggers immediately. Once activated, the WILD symbol expands across the reel and the other reels respin for free. This re-spin can be triggered up to three times in a row if more WILD symbols land. An RTP of 96% is average and the volatility is more on the medium side. Thanks to that, youβll be landing wins fairly regularly.
Theme and symbols Ultimate Crystals
BAR
Seven
Purple crystal
Green crystal
Orange crystal
Blue crystal
Yellow crystal
Special Symbols and Slot Features
3D
NO
Autoplay
YES
Free Spins
NO
Gamble Feature
NO
Locking Symbols
NO
Wild Symbol
YES
Win Multiplier
NO
Other features
Bonus Game
Expanding Wild
Other Features
Progressive Jackpot
WILD Symbol
The Ultimate Crystals online slot features special WILD substitute symbols. Their job is to replace all other symbols to create the highest possible winning combination.
Re-spin Feature
Whenever a WILD symbol appears on the reels, one free spin is automatically awarded. The WILD symbol expands to cover the full height of the reel it lands on, and the remaining reels re-spin. The maximum number of bonus spins you can get in a single session is three! Winnings during bonus spins are calculated based on the total stake that was active at the moment the free bonus spin was triggered.
Prize table
Symbol
Multiplier
3x in payline
4x in payline
5x in payline
BAR
50x
200x
250x
Seven
25x 60x 120xx
60x
120x
Purple crystal
10x
25x
60x
Green crystal
10x
20x
50x
Orange crystal
10x
15x
40x
Blue crystal
5x
10x
25x
Yellow crystal
5x
10x
25x
Our rating of the game
Ultimate Crystals
Ultimate Crystals from Kajot Games is proof that even without complex bonus rounds, a slot can still deliver an exciting and visually pleasing gameplay experience. Its strengths are the visual style, expanding WILD symbols and the re-spin mechanic, which adds a solid dose of suspense to every spin. Although the game lacks some modern features like free spins or advanced levels, it makes up for it with professional execution, clarity and the potential for attractive wins. If youβre looking for a slot thatβs beautiful, simple, and still doesnβt lose its pace, Ultimate Crystals definitely shouldnβt slip under your radar.
94%
Editor's rating
Design and theme
93 %
93 %
Features and playability
94 %
94 %
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.
Both-way paylines increase the chance of winning and make the game more dynamic than classic one-way slots
WILD symbols expand across the entire reel and trigger Re-spins, allowing additional winning combinations without an extra stake
Simple gameplay mechanics make it suitable for beginners too
Modern, futuristic crystal design, pleasant animations and unobtrusive electronic sound effects
Low and high stakes allow play even for players on a smaller budget
Short spins, a clear interface, intuitive controls and fast loading
The game focuses purely on wins and doesnβt overwhelm players with storylines or complicated tasks
Cons
It doesnβt include a wheel of fortune, bonuses or traditional free spins β which may disappoint fans of bonus features
Medium volatility may not appeal to players who like to take bigger risks
RTP is 96%, but even so this figure can be less attractive
No levels, symbol collection or missions β more advanced players may find it monotonous over time
Limited use of special features
Just 10 paylines is below average compared to other slots
Manufacturer Kajot
The Kajot brand is one of the most famous names in the gambling world. It has certainly earned the attention of its fans deservedly with all that it has successfully accomplished in this industry. It is a company from the Czech Republic, Czech players know its slots from online casinos and brick-and-mortar gambling halls.
18+| New players only | Deposit & wager at least Β£10 to get free spins | Free Spins winnings are cash | No max cash out | Eligibility is restricted for suspected abuse | Skrill deposits excluded | Free Spins value Β£0.10 per spin | Free Spins expire in 48 hours |Gambleaware.org. | Terms & Conditions apply
100% match on your first deposit (up to Β£100)
95%
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5 No-deposit Free Spins on Aztec Gems Slot
94%
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Software provider
Game typeSlot
Reels
Winning paylines10 paylines
