UKGC require us to verify your age before letting you play
Bonus-Menu is intended for visitors over the age of 18, including the free games section. To proceed, please register with us to verify your age. If you already have an account, simply log in to verify your age.
We evaluate slot machines based on multiple criteria, from which we make our final verdict.
Design and theme
80 %
Features and playability
85 %
RTP and volatility
95 %
Slot machine details and review 15 Coins Grand Diamond Edition
15 Coins Grand Diamond Edition from Wazdan takes the concept of bonus slots to a whole new level and, from the very first spin, makes it clear this wonβt be your standard reel-spinning session. The game runs on 5 reels and 3 rows and, just like the previous versions, it doesnβt include any classic paylinesβmeaning one thing: everything revolves around the bonus mechanics. Every spin comes with tension, because youβre waiting for the moment the main feature finally kicks in. If you enjoy risk, strategy, and holding out for a big moment, this slot can really pull you in.
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
15 Coins Grand Diamond Edition sticks to a modern jackpot theme, where values, coins and bonus features take centre stage instead of classic symbols. You wonβt find any fruit or card ranks here, because the game is built entirely around bonus symbols that only matter within the bonus round. The base game therefore feels more like a build-up to the main event, which is fairly unconventional but also an interesting approach. The whole concept focuses on collecting values and waiting for the right combination. The Cash Infinity symbol plays an important role. Compared to the base version, it offers higher values ranging from x5 to x15 of your stake, which boosts the win potential. Another interesting feature is Cash Out, which adds an extra layer of tension right in the base game.
The main highlight is once again Hold the Jackpot, which triggers when you land 5 Bonus symbols on the middle reel. The bonus plays out on an expanded grid of 15 positions and gives you 3 respins, which reset with every new symbol. During the feature you collect values, multipliers and the MINI, MINOR and MAJOR jackpots, with the Collector able to multiply wins up to x20. If you fill the entire grid, youβll land the GRAND Jackpot worth up to x5000 of your stake, which is a significant difference compared to the base version.
Theme and symbols 15 Coins Grand Diamond Edition
A new addition to the slot is the Cash Out feature, which can appear on the reels during the base game and stays active for 20 spins. During this time it collects values from various symbols, and once the countdown ends it pays out a random percentage of the collected amount, up to 300%. Another feature is Chance Level, which increases the chance of triggering the bonus at the cost of a higher stake, while keeping the symbol values the same. Thereβs also a choice of volatility, Risk and Bonus Buy, which expand your gameplay options.
Bonus Symbol
Throughout the entire game, you wonβt see any of the standard symbols youβre used to from regular slots. You can only win in Hold the Jackpot. All Bonus symbols only apply in the Bonus Game. If you land 5 Bonus symbols on the middle row, youβre guaranteed to trigger the Hold the Jackpot feature.
Cash Out
During the base game, a Cash Out tag can randomly appear on a reel and will stay there for up to 20 spins. If you spin Cash, Cash Infinity, MINI, MINOR or MAJOR jackpot, their values are added together. When the countdown on the tag reaches 0, a percentage (from 10β300%) is randomly selected and paid out to you together with the values of the Bonus symbols.
Cash Infinity Symbol
These symbols appear in the base game and remain on the reels until the end of the Hold the Jackpot Bonus Game. All symbols will be locked in place during spins. Bonus symbols can award wins ranging from x5 to x15 of your stake.
Hold the Jackpot Feature
Itβs played on 15 reels! All Bonus symbols stick on the reels, and to start with the feature awards you 3 respins. The feature continues until you run out of respins or until Bonus symbols appear on the reels. With Cash symbols you can win between x1βx10. During the feature, MINI, MINOR and MAJOR symbols can appear. The Collector will also collect the values of Cash and Cash Infinity and randomly multiply the stake by x1βx20. Mystery symbols can transform into another Bonus symbol (up to Cash Infinity)!
Jackpot Mystery symbols change into MINI, MINOR, MAJOR. If you manage to land 15 Bonus symbols of any type, youβll win the GRAND Jackpot worth x5000 your stake.
Chance Level
You can activate this feature during the base game too and choose one of three levels:
Level 1 with an x2 multiplier β your base stake is multiplied by x2, giving you 2x better odds of triggering the Hold the Jackpot Bonus Game.
Level 2 with an x5 multiplier (same rules, just with x6)
Level 3 with an x10 multiplier (same rules, just with x13)
The Chance Level feature β does not affect the paytable, which means symbol values remain the same.
Sticky symbols when changing Chance Level β these symbols are temporarily removed from the reels and will only appear at the Chance Level where they were won.
Volatility Selection
A unique feature of Wazdan slots is the ability to choose volatility! It depends on your playing style and preferences. You can choose between low, medium and high volatility. Volatility determines the frequency and size of wins. With low and medium volatility youβll get more wins, but theyβll be relatively small. With high volatility, you can hit so-called BIG WINs!
Risk Feature
Once you land a winning spin, you have the chance to use your win in the Risk feature. Youβll choose between two symbols. After your pick, a draw takes place to determine the symbol. After each round, you can either leave the feature or push on for up to 7 draws. But be careful β you can lose your entire win!
Bonus Buy
Using the basket button, you can buy the Hold the Jackpot Bonus Game and activate it at the Extreme and Double Extreme Volatility levels, which are known for bigger wins than other Volatility Levels.
Our rating of the game
15 Coins Grand Diamond Edition
15 Coins Grand Diamond Edition is an ambitious slot that puts everything into bonus features and high win potentialβand on that front, it definitely delivers. Hold the Jackpot is stronger than ever, Cash Infinity offers higher values, and the new Cash Out feature adds an interesting element even in the base game. On the other hand, the base game still feels like waiting for the bonus, which wonβt suit everyone. Chance Level and Bonus Buy give you more control, but they also increase the demands on your bankroll. Overall, itβs a slot for players chasing big wins who donβt mind waiting for the right moment.
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 Β£10 and your spins can be played at the Β£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. Gambleaware.org. All the OJO Rewards and Game Play policies apply.
Bingo Bonus: First deposit only. Deposit Β£10 or more to claim. 50 free spins on Big Bass Bonanza slot. 500 free bingo tickets when you spend Β£10 on bingo, valid once per player. Free tickets valid on selected games up to Β£0.10 each, see bingo rooms for info. Excludes players in N.I. Irregular play may lead to removal of reward. OJOβs Rewards and Game Play policy applies.
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. 18+. Min. deposit Β£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.
Β£50 deposit bonus – New players only. Min. deposit Β£10. 30 days to activate & 60 days to use deposit bonus after activation. Wager req.: 10x on eligble games. Max. Bonus Β£50 . Bonus balance is paid with 10% Increments to account balance. Bonus balance is not payable. Max. bet is Β£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. 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. 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. 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 UK Customers only. Deposit and stake Β£20. Debit Card only (exclusions apply). 50 free spins credited daily over first 3 days, 24 hours apart. 150 free spins total. Spin value locked at Β£0.1 per spin. No wagering requirement on the winnings of the free spins. Spins expire after 7 days. Betway reserves the right to terminate the bonus in case players do not stick with the T&Cs. 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 Β£10 and your spins can be played at the Β£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. Gambleaware.org. All the OJO Rewards and Game Play policies apply.
Bingo Bonus: First deposit only. Deposit Β£10 or more to claim. 50 free spins on Big Bass Bonanza slot. 500 free bingo tickets when you spend Β£10 on bingo, valid once per player. Free tickets valid on selected games up to Β£0.10 each, see bingo rooms for info. Excludes players in N.I. Irregular play may lead to removal of reward. OJOβs Rewards and Game Play policy applies.
11 FS – New players only. 18+. Min. deposit Β£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.
Β£50 deposit bonus – New players only. Min. deposit Β£10. 30 days to activate & 60 days to use deposit bonus after activation. Wager req.: 10x on eligble games. Max. Bonus Β£50 . Bonus balance is paid with 10% Increments to account balance. Bonus balance is not payable. Max. bet is Β£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. Gambleaware.org
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
Register, verify your age, and play slots for free!
Forgotten Password
UKGC require us to verify your age before letting you play
Cookie Consent
We use cookies on our website (including third party cookies). This helps us to display content correctly, find out what's happening on the site and offer you tailored ads. Check here for more information.
Functional
Always active
The technical storage or access is strictly necessary for the legitimate purpose of enabling the use of a specific service explicitly requested by the subscriber or user, or for the sole purpose of carrying out the transmission of a communication over an electronic communications network.
Preferences
The technical storage or access is necessary for the legitimate purpose of storing preferences that are not requested by the subscriber or user.
Statistics
The technical storage or access that is used exclusively for statistical purposes.The technical storage or access that is used exclusively for anonymous statistical purposes. Without a subpoena, voluntary compliance on the part of your Internet Service Provider, or additional records from a third party, information stored or retrieved for this purpose alone cannot usually be used to identify you.
Marketing
The technical storage or access is required to create user profiles to send advertising, or to track the user on a website or across several websites for similar marketing purposes.
Software provider
Game typeSlot
Reels
