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Jack and the Mystery Monsters Slot - Review, Free & Demo Play

Jack and the Mystery Monsters
Jack and the Mystery Monsters
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Updated: 22.07.2025
Reviewed by: Ella Houghton

Hey, are you ready to join Jack and his friendly-looking monsters heading into the forest in this game since 01/06/2020? Then we will tell you about the online slot Jack and the Mystery Monsters from the provider Synot.

This slot offers you great bonuses like Wild multipliers and free spins. There is also a bonus game with up to 200 times your bet.

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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 Jack and the Mystery Monsters slot

General information about Jack and the Mystery Monsters slot

Rating by Ella Houghton:
7.9
SYNOT Games
Write a review +25 SJ points
  • Release Date:
    01.06.2020
  • Volatility:
    Medium
  • RTP:
    96.2%
  • Multiplier:
    Yes
  • Max. win:
    2,500x
  • Bonus game:
    Yes
  • Free spins:
    Yes
  • Scatter Symbol:
    Yes
  • Wild symbol:
    Yes
  • Symbol Stacked:
    No
  • Jackpot Game:
    No
  • Slot lines:
    15
  • Slot reels:
    5
  • Layout:
    5-3
  • Stakes range (€/£/$):
    0.12 to 80
  • Slot Theme:
    Forest
  • Technology:
    JS, HTML5
More infoLess info

Licensed and tested by

  • Gambling Comission
  • Gaming comission
  • HGC (Hellenic Gaming Comission)
  • MGA
  • ONJN
  • Spel inspectionen

How to Play

The Jack and the Mystery Monsters online slot has 15 fixed paylines and straightforward gameplay. You spin the symbols on 5 colorful reels and 3 rows, and if you're lucky, you land winning combinations and cash out. The game is simple, whether you are familiar with slots or not.

  1. Start by choosing your total bet. Then, all symbol payouts are multiplied by the total bet, so there is no problem adjusting the bet per line (€0.12–€80)
  2. After choosing a bet, click on the spin button to make the reels spin
  3. You can choose to autoplay if you want the reels to spin automatically without your supervision
  4. A win is only counted if it appears with matching symbols, on any paylines, from left to right and on adjacent reels

Jack and the Mystery Monsters RTP and Volatility

8.2 
Jack and the Mystery Monsters online slot offers players medium volatility and an RTP of 96.20%.

With the help of the volatility level and RTP, you will understand how often you can win this game.

For example, Jack and the Mystery Monsters online slot gives you an average RTP of 96.20%. Combine that with medium volatility and you'll get some decent rewards from time to time.

Theme

9.2 

Join Jack and his friendly-looking monsters as they venture into the forest in this game. The game has an unusual cartoon theme with elements of monsters and forests. Although Synot is a small developer, they have made Jack and the Mystery Monsters slot visually appealing to players. The drums are set against a backdrop of a dark forest lit by fireflies, with these strange monsters in different colors.

The reels of Jack and the Mystery Monsters slots have a variety of symbols, some of which open bonuses, while others give players impressive payouts. For example, you can find the free spins symbol, the bonus symbol, Jack, the wild symbol and the backpack symbol acting as a scatter.

The Wild symbol will reward you with 1,000x, 100x, 10x, and 1x your total bet on 5, 4, 3, and 2 symbols on any of the paylines. The Scatter then pays 50x, 20x, 5x, and 2x your stake anyway when you land a combination of 5, 4, 3, and 2 without triggering free spins as it is often the case in online slots.

Next, come the familiar characters. Red Monster offers 50x, 10x, 5x, and 0.5x your total bet on 5, 4, 3, and 2 symbols on any of the paylines.

Then we have purple and blue monsters with the same rewards of 15x, 5x, 1x, and 0.25x your stake for getting 5, 4, 3, and 2 symbols of the same kind in a win.

The green monster and the A symbol give the same payouts of 10x, 5x, and 0.5x your total bet.

Finally, we have K, Q, J, and 10, all of which offer the same rewards. They will all pay out 5x, 1x, and 0.25x your stake.

Theme
Jack and the mystery monsters slot paytable

Mobile Compatibility

Jack and the mystery monsters slot mobile

The mobile version is essential for gamers because everyone wants to make sure that they don't have any problems with the game because of what device they play on.

The Jack and the Mystery Monsters online slot has a mobile version, which allows you to play from a PC, smartphone or tablet on any operating system (iOS, Windows, Android) and any browser. At the same time, the level of quality and function will not decrease.

About Synot

Synot is a provider with over 30 years of experience in gambling entertainment. In particular, the company is engaged in the creation of online slots.

They are based on original storylines, impressive special effects, thoughtful gameplay and verified mathematical models. Thanks to this, the brand's slot machines are trendy in online casinos in 30 countries worldwide.

Synot provider creates multi-platform games. This allows you to run them not only on a computer but also on any portable device.

Bonus Rounds & Free Spins

7.7 

Free Spins

Free spins are triggered by landing symbols with “Free Spins” written on them. The free spins feature comes with an increasing multiplier bonus. It starts at 1x and increases by one every time a wild symbol appears on the reels. It can increase your winnings up to 21x during free spins. Wild can replace all symbols here, except for the Scatter. Free spins cannot be restarted.

Bonus Game

Then we have the Jack and the Mysterious Monsters Bonus Game triggered by three bonus symbols landing simultaneously on the 3rd, 4th, and 5th reels. It has two locations. In the first location, you choose 1 of the 5 hidden prizes. Then in the second, you choose 1 of the 2 hidden multipliers.
Jack and the Mystery Monsters slot Bonus Game

Jack and the Mystery Monsters Demo Play

The game's demo version will allow you to decide whether you will continue to play it for real money. After all, we all have different interests, so we pay attention to the various functions of the game.

So play the free demo of Jack and the Mystery Monsters online slot. It will help you understand your level of liking for the game.

Max Win

6.3 
Jack and the Mystery Monsters will increase your bet by 2,500x.

The maximum win is another of the most critical elements of the slot, because players want to know how and by how much they can increase their bet.

For example, the maximum jackpot on Jack and the Mystery Monsters will increase your stake by 2,500x, the average in the online slots market.

Overall Rating

7.9

The superb quality of the visuals and animations is the first thing that catches your eye when you open Jack and the Mysterious Monsters. Cartoon monster icons are original and cute. Bonus features further enhance the winning potential of this magical-themed slot.

Synot has created a genuinely charming game, so you should at least give it a try.

Hits
Free spins
Special symbols
Bonus game
Interesting themes and high-quality graphics
Misses
You cannot buy a bonus
No progressive jackpot

Jack and the Mystery Monsters Slot - FAQ

What is the maximum win in Jack and the Mystery Monsters online slot?

The Jack and the Mystery Monsters online slot will increase your bet by 2,500 times.

Does Jack and the Mystery Monsters slot support the mobile version?

Yes, you can play Jack and the Mystery Monsters right on your mobile browser.

What are the volatility and RTP in Jack and the Mystery Monsters?

Jack and the Mystery Monsters online slot offers players medium volatility and an RTP of 96.20%.

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Ella Houghton
Ella Houghton
Expert in: News, Blog, Slot reviews, Payments
Ella is a professional content-writer with 8 years of experience in the casino sphere. She has broad knowledge of gambling related themes and is happy to share this with Slotsjudge.

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Reviewed by Editor-in-Chief
Nikita Lukanenoks
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