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Diamond Mystery 20 Imperial Crown Deluxe Slot - Review, Free & Demo Play

Diamond Mystery 20 Imperial Crown Deluxe
Diamond Mystery 20 Imperial Crown Deluxe
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Updated: 22.07.2025
Reviewed by: Joe Booth
The Greentube provider offers a chic classic, the Diamond Mystery 20 Imperial Crown Deluxe. In this slot, you can enjoy high-paying symbols, Expanding Wilds, and jackpots. The game was released on 20/07/2023 and is available on all platforms at the best online casinos. In this review from Slotsjudge, you will learn all the details about this slot and even be able to test it in demo mode.
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In this review
  1. Slot details
  2. Theme
  3. Bonus Rounds & Free Spins
  4. Summary
  5. Where to play
General information about Diamond Mystery 20 Imperial Crown Deluxe slot

General information about Diamond Mystery 20 Imperial Crown Deluxe slot

Rating by Joe Booth:
7.8
User’s Rating: Not rated yet
Greentube
Write a review +25 SJ points
  • Release Date:
    20.07.2023
  • Volatility:
    Medium
  • RTP:
    95.5%
  • Multiplier:
    No
  • Max. win:
    5,000x
  • Bonus game:
    No
  • Free spins:
    No
  • Scatter Symbol:
    Yes
  • Wild symbol:
    Yes
  • Symbol Stacked:
    No
  • Jackpot Game:
    Yes
  • Slot lines:
    20
  • Slot reels:
    5
  • Layout:
    5-3
  • Stakes range (€/£/$):
    0.20 to 50
  • Slot Theme:
    Fruits
  • Technology:
    JS, HTML5
More infoLess info

Licensed and tested by

  • Gambling Comission

How to play

The Diamond Mystery 20 Imperial Crown Deluxe slot has a recognizable classic 5x3 scheme with 20 fixed lines. In order to win, you need to collect from 3 to 5 identical symbols from left to right on active lines. Wilds help you replace base symbols, plus, they can expand. Also, you can increase each win in the gamble game. How to start playing:

  1. Register at a reliable casino and make a deposit
  2. Then, find the Diamond Mystery 20 Imperial Crown Deluxe slot by selecting the Greentube provider
  3. Next, set spin rates from €0.20 to €50 and press ‘Play’
  4. You can also set autoplay mode and turbo spin

Diamond Mystery 20 Imperial Crown Deluxe RTP and Volatility

7.5 
In the classic Diamond Mystery 20 Imperial Crown Deluxe slot, you will be spinning fruit reels with an RTP of 95.48% and medium volatility.
Yes, it's good that the Greentube provider added medium volatility and generous potential, and this is a salvation, as the game has a 95.48% RTP which is a slightly lower than average. We advise you to play with restraint and not take too many risks. In this section, we will give a rating of 7.5.

Theme

7.5 

Diamond Mystery 20 Imperial Crown Deluxe by Greentube does not have a plot as it is a classic game. However, the graphics of the machine are top-notch, which is worth the animations and effects when a win occurs. We are glad that even the classic slot is given due attention to the graphics and therefore we will give a rating of 7.5.

When spinning the reels in the slot from Greentube, you will need to collect fruits and gambling symbols in order to receive a payout. For example, fresh fruit pays up to 5x, bluebell up to 10x, watermelon and grapes up to 25x, and sevens up to 150x. Blue Scatters can be found on reels 1, 3, and 5 and can pay 20x for 3 of them. Red Scatters can be found on any reel and are worth up to 100x. You will also have Wilds that can expand.

Theme
Diamond mystery 20 imperial crown deluxe slot - payouts

Mobile Compatibility

Diamond Mystery 20 Imperial Crown Deluxe slot mobile
The chic Diamond Mystery 20 Imperial Crown Deluxe slot machine will be available on all devices, both on PC and mobile gadgets. Therefore, you will be able to spin the reels and claim the jackpots using your iOS and Android smartphones.

About Greentube

The Greentube provider is one of the leaders in the iGaming industry for the development and supply of gambling entertainment. This provider started with land-based machines and was part of the Novomatic division, but now, Greentube is already an independent company. The team started its journey in 1998 and now, has already got a catalogue of games, in which there are more than 400 different software titles. For example, Diamond Link: Cops 'n' Robbers, Cops 'n' Robbers Big Money Trick or Treat, and Bingo Staxx Amazon Fury.

Bonus Rounds & Free Spins

8 

Yes, the Diamond Mystery 20 Imperial Crown Deluxe slot does not have many bonuses and features no free spins, but who needs such features when you love classics and jackpots. What we want to say is that there are no usual bonuses in the game since it is a classic one. Since the game still has features and they are interesting, we will put a rating of 8.

Expanding Wilds

When you find Wilds on reels 2, 3, and 4, they can expand to the entire reel to give you more chances to win.

Risk Game

Each of your winnings, with the exception of jackpots, you can increase by 2x. If you activate the Gamble round, there, you need to guess the colour of the card in order to get an increased win. The maximum win in this round is 750x.
Diamond Mystery 20 Imperial Crown Deluxe slot - feature

Diamond Mystery 20 Imperial Crown Deluxe Demo Play

In this review, we have added a demo mode of the Diamond Mystery 20 Imperial Crown Deluxe slot so that you can understand the mechanics in detail and test all the features, even the jackpots.

Max Win

8 
The Greentube provider has added a generous potential of up to 5,000x max win to their release.

Such winnings can be obtained if you hit the Diamond jackpots. Also, 3 more different jackpots will be waiting for you. In general, such a win is quite excellent and we will give a rating of 8 for this.

Jackpot

In the game, you will have an opportunity to activate the mystery jackpot game which can be triggered at any time when you have no winnings. As soon as this happens, a game will open where you need to open the hole cards and find 3 of the same to get the corresponding jackpot. Available jackpots are as follows:

  • Green – 50x
  • Blue – 200x
  • Red – 1,250x
  • Diamond – 5,000x

Diamond Mystery 20 Imperial Crown Deluxe video review

✅ Try this slot for free on our website - https://slotsjudge.com/online-slots/diamond-mystery-20-imperial-crown-deluxe/ Hi everyone! In this video we’ll show you bonus game in Diamond Mystery 20 Imperial Crown Deluxe from Greentube. The slot machine has average volatility and RTP of 95.5%. The playing field consists of 5 reels and 3 rows, the minimum bet starts with $0.20, and the maximum bet reaches $50. By the way, the maximum winnings are 5,000x of the bet size.The main features of the machine are Scatter Symbol, Wild symbol and Jackpot Game. Write in the comments, have you played Diamond Mystery 20 Imperial Crown Deluxe from Greentube and how do you like the winnings presented in this video! No links used during live stream or in the description are transaction links. 18+ | Play Responsibly | Begambleaware.org. #slots #onlinecasino #bigwin

Overall Rating

7.8
Diamond Mystery 20 Imperial Crown Deluxe is a great classic slot that comes with 4 different fixed jackpots, expanding Wilds, and Gamble round. Yes, there are no free spins in the slot, but this is a classic game and therefore, real connoisseurs will understand this release from Greentube.
Hits
Jackpot of up to 5,000x
High-quality graphics
Gamble round
Expanding Wilds
Misses
The 95.48% RTP could be higher

Diamond Mystery 20 Imperial Crown Deluxe Slot - FAQ

Where can I play Diamond Mystery 20 Imperial Crown Deluxe for real money?

Our Slotsjudge team has added a rating list of the best online casinos, this classic release and other Greentube slots are already there.

What is the potential of the Diamond Mystery 20 Imperial Crown Deluxe slot?

The game has 4 fixed jackpots and the biggest one is Diamond worth 5,000x which is very generous.

How to increase your winnings by 2x in the Gamble round?

After each successful spin, there will be an opportunity to activate the Gamble round. There, you need to guess the color of the card to get a 2x increased win.

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Joe Booth
Joe Booth
Expert in: News, Blog, Slot reviews, Payments
Joe is an expert online casino player, who knows all the tricks and tips on how to get to the most massive wins. He is also an experienced online casino games reviewer, with hundreds of written articles behind him, on all kinds of online casino games. He makes sure to play them, see how they work, and then gives his honest expert opinion about them to other players, our readers. 

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Reviewed by Editor-in-Chief
Nikita Lukanenoks

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