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We evaluate slot machines based on multiple criteria, from which we make our final verdict.
Design and theme
93 %
Features and playability
92 %
RTP and volatility
96 %
Slot machine details and review Dark Vortex
Dark Vortex is a darkly themed video slot from renowned developer Yggdrasil Gaming. The game is inspired by mysterious and spooky stories that will draw players into a world full of magic and unknown creatures. At first glance, it will captivate you with detailed graphics, a dark atmosphere and dramatic music that increases the tension with every spin. The base game starts on 5 reels with 243 paylines, but thanks to special features it can be expanded to 5 reels and 3,125 paylines.
Every slot machine must be manufactured by a company that invented, designed and put it into operation. Many players eventually find that they only enjoy playing on machines from specific manufacturers, so they narrow down their selection by preferred software manufacturers. In the Czech Republic, the most popular machines are from local software manufacturers such as Kajot or Synot.
What are the Cylinders or Reels on a slot machine?
Reels are the basic element of most slot machines and are columns of symbols that spin and stop on the screen gradually during the game. They are therefore the basic element on which symbols spin and on which winning combinations are formed. The most popular numbers of reels are 3 and 5.
Paylines on slot machines are imaginary lines that run through the reels of the machine and determine which combinations of symbols on these lines are considered winning. As the reels spin, players try to achieve winning combinations of symbols on these lines. Combinations must always start from the left. Each payline has its own payout value, and the winnings are determined by the paytable for each symbol on the particular machine. Modern slot machines can have hundreds of paylines, and players often have the option to choose how many of these lines they bet on.
243 paylines
3125 paylines
Themes
Each slot machine has its own design or theme that appeals to a specific group of players. If you want to play slots with fruit symbols 🍉 or with an Egyptian theme 🐫, no problem. Just choose and we will narrow down the selection of slots to your taste.
🦴 Others
👽 Sci-Fi
RTP
What is RTP
The RTP of slot machines is a rule of thumb for how much money a slot machine will return to players. Let's say you put 100 crowns in it, the RTP determines how much of that money you should get back. The average value is 92 to 97%.
96.5%
Layout
5x3
Slot theme and symbols
Yggdrasil Gaming is known for its high quality graphics, and Dark Vortex is no exception. The game takes place against the backdrop of a dark forest full of fog and mysterious silhouettes. The symbols on the reels include various magic books, elixirs, demons and other mystical objects. The sound effects and music perfectly complement the visual side of the game, creating a gloomy atmosphere that draws the player into the story. When two or more Vortex symbols appear on the reels, the expanding reels feature is activated. These reels expand to 6 rows, increasing the number of win lines. If three or more Vortex symbols are activated, the player gains access to bonus games. The bonus game is triggered when at least three Vortex symbols are activated. The player has the opportunity to get free spins, during which the reels can be further expanded, increasing the chances of bigger wins. WILD symbols substitute for all other symbols except Vortex symbols, increasing the chances of forming a winning combination.
Theme and Symbols Dark Vortex
Red Devil
Purple giant
Green monkey
Light blue monster
Dark blue rat
Red book
Purple book
Green book
Light blue book
Dark blue book
Special Symbols and Slot Features
3D
NO
Autoplay
YES
Free Spins
YES
Gamble Feature
NO
Locking Symbols
NO
Wild Symbol
YES
Win Multiplier
NO
Other features
Bonus Game
Other Features
WILD Symbol
Dark Vortex by Yggdrasil Gaming is full of special symbols and features that make the game more interesting and increase the chances of winning. The WILD symbol can substitute for all other symbols except the Vortex symbol. This helps players form winning combinations and increases their chances of winning.
Vortex Reel Feature
The slot features Vortex symbols that, when displayed on two adjacent reels, trigger the Vortex Reel feature. While the Vortex Reel is active, the number of symbols on the reel on which the Vortex symbols appear expands to 5 for 3 consecutive spins. If another Vortex symbol appears on an adjacent reel during this time, the number of symbols on that reel expands to 5, extending the Vortex Reel feature by 2 technical games. In the event that a bet is changed while the Vortex Reel feature is active, the feature will end.
Orb Collection
The slot features Orb symbols that appear during the Vortex Reel feature and only on the expanded reels of this feature. When the Vortex Cylinder feature appears, 2 pink and 5 blue Orbs are added to the Orb Collection.
1. Pink Orb Collection
Each Pink Orb displayed during the Vortex Reels feature is added to the collection on the left side of the game board. For each Pink Orb, one WILD symbol is included on the three middle reels during free spins. Pink Orbs appear on reels 1 and 5.
2. Collection of Blue Orbs
Each blue Orb displayed during the Vortex Reels feature is added to the collection on the right side of the reels. Each blue Orb awards one bonus spin during the free spins feature. Blue Orbs appear on reels 2, 3 and 4.
Free Spins
When Vortex symbols appear on all reels (either simultaneously or as part of the Vortex Reels feature) and all games within the Vortex Reels feature trigger Free Spins. A bonus spin is awarded for each blue Orb in the collection. During Free Spins, stacked WILD symbols appear in consecutive positions on the 3 middle reels.
Prize table
Symbol
Multiplier
3x in payline
4x in payline
5x in payline
Red Devil
20x
25x
60x
Purple giant
10x
15x
40x
Green monkey
10x
15x
40x
Light blue monster
8x
12x
30x
Dark blue rat
8x
12x
30x
Red book
4x
5x
12x
Purple book
3x
4x
9x
Green book
3x
4x
9x
Light blue book
2x
3x
7x
Dark blue book
2x
3x
7x
Our rating of the game
Dark Vortex
Dark Vortex is one of those slot machines that excels in atmosphere, graphics and innovative game features. Yggdrasil has once again proven that they can create games that are not only visually appealing, but also fun and exciting. If you are looking for something different from the usual slot machines and you like dark and mystical stories, Dark Vortex is worth a try. Dark Vortex is suitable for both experienced players and beginners. We recommend starting with lower bets to get acquainted with the game mechanics and features, and you can gradually increase the bets once you feel comfortable.
We evaluate slot machines based on multiple criteria, from which we make our final verdict.
Design and theme
85 %
Features and playability
83 %
RTP and volatility
96 %
Pros
Dark Vortex features top-notch graphics with a dark and mysterious design that draws players into the game world. Sound effects and music perfectly complement the atmosphere and increase the tension.
The game differs from traditional slots due to its expanding reels feature and the ability to expand the number of pay lines up to 3,125. This mechanic brings greater chances of winning and increases the overall dynamics of the game.
Dark Vortex offers various bonus features, including expanding reels, free spins and wild symbols. These features increase the chances of winning and add extra layers of excitement to the game.
With a return to player (RTP) of 96.5%, the game provides players with above-average chances of winning, which increases its appeal.
For players looking for the potential for big wins, the game offers medium to high volatility, meaning wins may be less frequent but higher.
Cons
Due to its unique game mechanics and expanding reels, the game can be more difficult for new players to understand. It is recommended that players familiarize themselves with the rules and features before starting to play.
While high volatility can be an advantage for players looking for big wins, it also means that wins will fall less frequently.
While the dark and spooky atmosphere is one of the game's main attractions, it may not be suitable for all players. Some players may prefer lighter and more cheerful themes.
For some players, the minimum bet of 0.10 may be higher than they would like, which may affect their decision to play.
While the game is available at many online casinos that offer games from Yggdrasil Gaming, it may not be available in all regions or on all platforms.
Manufacturer Yggdrasil
Yggdrasil slots are known for their innovative game mechanics and great graphics. Yggdrasil often features themes inspired by mythology and fantasy worlds, making them a very popular slot manufacturer.
Bonuses to casinos where slots Yggdrasil slots can be played
Rating
96%
How do we rate bonuses?
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.
Use the bonus spins offer at PlayOJO to get 50 FS on the Big Bass Bonanza slot. The minimum required deposit to activate the bonus is £10 and your spins can be played at the £0.1 chip size. Note that the bonus is not available for players from N.I. Irregular play may lead to the removal of rewards. All the OJO Rewards and Game Play policies apply.
Rating
94%
How do we rate bonuses?
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.
5 Free Spins – New players only, No deposit required, valid debit card verification required, max bonus conversion £50, 65x wagering requirements,Full T&Cs apply. Up to 500 Free Spins – New players only, £10 min fund, free spins won via mega reel, max bonus conversion to real funds equal to lifetime deposits (up to £250), 65x wagering requirements and full T&Cs apply here
Rating
93%
How do we rate bonuses?
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.
11 FS – New players only. Min. deposit £10. Account ballance is withdrawable at any time. Upon withdrawal, any remaining bonus spins are forfeited. 7 days to activate the spins. Bonus spins will expire 24 hours after activation. Full T&C Apply.
£200 deposit bonus – New players only. Min. deposit £10. 30 days to activate & 60 days to use deposit bonus after activation. Wager req.: 35x on eligble games. Max. Bonus £200. Bonus balance is paid with 10% Increments to account balance. Bonus balance is not payable. Max. bet is £20 or up to value 50% of the bonus amount – whichever is lowest. Account ballance is withdrawable at any time. Upon withdrawal, any remaining deposit bonus is forfeited. Full T&C Apply, play responsibly.
Rating
93%
How do we rate bonuses?
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.
New UK-based customers only. You must opt-in & deposit £10+ via a debit card to qualify | Offer valid 7 days from registration | Welcome Bonus: 100% match up to £100 on 1st deposit. 50x wagering applies (as do weighting requirements) | Free Spins: Awarded on Centurion Big Money once you have staked £20 on any Games Global game. Spin value = 10p | No wagering requirements on free spin winnings
Rating
92%
How do we rate bonuses?
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+. Sign up, deposit and stake on Big Bass Bonanza, and receive Free spins on Big Bass Bonanza. 30 day bonus expiry. Ends 14/02/25 at 23:59 GMT. Full T&Cs Apply. begambleaware.org.
Warning: Play and gamble responsibly | Gambling may be addictive 18+ | Underage gambling is an offence | When the fun stops, stop.
Use the bonus spins offer at PlayOJO to get 50 FS on the Big Bass Bonanza slot. The minimum required deposit to activate the bonus is £10 and your spins can be played at the £0.1 chip size. Note that the bonus is not available for players from N.I. Irregular play may lead to the removal of rewards. All the OJO Rewards and Game Play policies apply.
5 No-deposit Free Spins on Aztec Gems Slot
94%
+ Chance to win up to 500 Free Spins on Starburst and other prizes
5 Free Spins – New players only, No deposit required, valid debit card verification required, max bonus conversion £50, 65x wagering requirements,Full T&Cs apply. Up to 500 Free Spins – New players only, £10 min fund, free spins won via mega reel, max bonus conversion to real funds equal to lifetime deposits (up to £250), 65x wagering requirements and full T&Cs apply here
11 FS – New players only. Min. deposit £10. Account ballance is withdrawable at any time. Upon withdrawal, any remaining bonus spins are forfeited. 7 days to activate the spins. Bonus spins will expire 24 hours after activation. Full T&C Apply.
£200 deposit bonus – New players only. Min. deposit £10. 30 days to activate & 60 days to use deposit bonus after activation. Wager req.: 35x on eligble games. Max. Bonus £200. Bonus balance is paid with 10% Increments to account balance. Bonus balance is not payable. Max. bet is £20 or up to value 50% of the bonus amount – whichever is lowest. Account ballance is withdrawable at any time. Upon withdrawal, any remaining deposit bonus is forfeited. Full T&C Apply, play responsibly.
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Game typeSlot
Reels
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Themes
RTP
