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Booster Slot - Review, Free & Demo Play

Booster
Booster
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Updated: 22.07.2025
Reviewed by: Ella Houghton
Booster is a space-themed video slot that was launched on 27/06/2017 by iSoftBet. This is a slot machine that particularly intrigues us due to its lucrative bonus game and some other exclusive bonuses. In our ultimate review, you will learn all you need about the unique bonus features and playing mechanics of Booster. Shall we dive right in?
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18+ | New players only | Terms Apply | Please play responsibly | gamblingtherapy.org

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In this review
  1. Slot details
  2. Theme
  3. Bonus Rounds and Free Spins
  4. Summary
  5. Where to play
General information about Booster slot

General information about Booster slot

Rating by Ella Houghton:
8.5
iSoftBet
Write a review +25 SJ points
  • Release Date:
    27.06.2017
  • Volatility:
    Medium
  • RTP:
    97.2%
  • Multiplier:
    Yes
  • Max. win:
    6,816x
  • Bonus game:
    Yes
  • Free spins:
    Yes
  • Scatter Symbol:
    Yes
  • Wild symbol:
    Yes
  • Symbol Stacked:
    No
  • Jackpot Game:
    No
  • Slot lines:
    25
  • Slot reels:
    5
  • Layout:
    5-3
  • Stakes range (€/£/$):
    0.25 to 25
  • Slot Theme:
    Space
  • Technology:
    JS, HTML5
More infoLess info

Licensed and tested by

  • GLI (Gaming Labs Certified)
  • iTech Labs
  • ONJN

How to Play

Take a look at our step-by-step guide that will help you get started with Booster:

  • Open the slot and wait while it’s loading
  • Click ‘i’ and study the game’s paytable and bonuses
  • Adjust the music and sounds by clicking the triple-bar button below the reels
  • Select the coin value and set your starting bet between €0.25 and €25
  • Click the circular arrow and wait for your wins

Booster is a video slot with 5 reels, 3 rows, and 25 paylines. All winnings in this game are paid from left to right, except for the Scatter wins. Before you make your spins, don’t forget to select the coin value below the reels. Each spin will cost 25x your chosen coin value. In a separate section of this review, we will explain how the various bonus features of Booster work in your favor.

Booster RTP and Volatility

9 
Booster has got an RTP rate of 97.2% and medium to low volatility.
We were more than pleasantly surprised to find out about the perfect combination of the RTP and volatility of Booster. With such a decent ratio, this video slot is truly capable of boosting your stake. However, don’t forget that these factors are only theoretical and tend to fluctuate depending on the active bonus feature. Be aware of the dead spins.

Theme

8.5 

Booster is a beautifully designed slot machine that is, on top of it, very easy to figure out. The visual quality of the interface remains on top regardless of the device you’re using to play, and smooth background music only adds to the general atmosphere. Although it’s a classic slot machine with no outstanding concept, the idea is implemented skilfully. As you spin the slot, you can get distracted by the animations of starts that are slowly flowing in the space just behind the transparent reels. Besides, some minor neon accents make the game even more bright but not too overwhelming.

The regular paytable in Booster includes 3 BAR symbols, a golden star, and 2 Sevens, blue and red. Besides, there is a valuable multicolored diamond symbol, capable of giving out up to 200x your total stake!

The exclusive Bonus symbols in Booster will activate the Bonus Game in case you get a winning combo of 3, 4, or 5 of these symbols anywhere on the reels.

Theme
Booster slot - payouts

Mobile Compatibility

Booster slot - mobile
With the current fast development of mobile gambling, a lot of players switch to using mobile versions of their favorite slot machines. That is why a slot must be fully mobile-compatible. Thanks to modern solutions in mobile gambling, such as HTML5 and JavaScript technologies, Booster is available for everyone who wishes to play using their phone.

About iSoftBet

iSoftBet is an online casino and video slot developer that entered the market back in 2010. Currently, the company has more than 10 years of experience in developing live casino games and online slot machines. The provider is surely up to experimenting and coming up with creative slot concepts and ideas. The most popular products by iSoftBet now include Moriarty Megaways, Gold Digger, Euphoria, Queen of Wonderland Megaways, and many others.

Bonus Rounds & Free Spins

7.5 

Free Spins

During the Free Spins round, any Bonus symbol on the reels will pay out as a Scatter and award you 2x, 15x, or 30x your total bet.

Bonus Game

As soon as you get a winning combo of 3, 4, or 5 Bonus symbols on the reels, they will trigger the Bonus Game. This bonus round will give you the chance to obtain up to a 600x stake multiplier or Free Spins with bet multipliers up to x5. Bear in mind that the Bonus Game cannot be re-triggered during Free Spins.
Booster slot - feature

Booster Demo play

If you want to give Booster a try for free before making real cash bets, we suggest that you try our free demo version. The demo will give you a chance to test all features of this slot machine for free before playing it in a casino.

Max Win

8.8 
The max win you can achieve in Booster is 6,816x your bet.
The max win of Booster is a bit lower than we expected. However, given that the slot has got a decent RTP and a medium to low volatility, we’ll let it pass. Apart from the decent winning potential, Booster also gives you plenty of ways to achieve the top jackpot. Don’t forget to benefit from Free Spins and the Bonus Game as soon as you trigger them on the reels.

Overall Rating

8.5
Booster is a simple but well-thought-out slot machine with some lucrative bonus features available. The presence of the Bonus Game and Free Spins with bet multipliers will make your gambling experience both fruitful and very fun. We can’t wait until you try Booster yourself and get a taste of its best perks!
Hits
Free Spins
High RTP
Bonus Game
Misses
No progressive jackpot

Booster Slot - FAQ

Do I Need to Make a Deposit to Play this Game?

You can either make a deposit in a casino or play our free demo version of Booster right on this page.

What is the Most Valuable Symbol in Booster?

The most valuable symbol you can find in Booster is the Bonus symbol, capable of activating the Bonus Game.

What is the Return to Player (RTP) rate of Booster?

Booster has got an RTP rate of 97.2 and medium to low volatility.

Does Booster have a progressive jackpot?

Unfortunately, Booster is not a progressive slot machine.

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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.

2128 articles

Reviewed by Editor-in-Chief
Nikita Lukanenoks
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