Booster Slot

by iSoftBet
RTP: 95,6%
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Booster slot machine by iSoftBet has 5 reels, 25 fixed pay lines, and a bonus game that can award multipliers, Free Spins or 6,000 coins. This is a classic slots experience. The rules are simple, the payouts are good, and the game works on any device. In other words, if you are looking for good old slots games, you should definitely check out the Booster video slot. As always, start with our slot game review and play the demo version first. After that, you can pick an online casino to play for real money. Make sure to take a look at our entire collection too. You can play online slot machines for free on SlotoZilla!

Booster Slot Review


RTP 95,6%
Software iSoftBet
Theme 777 Slots
Min Bet / Max Bet 0.25-25
Min coins per line 0.25
Max coins per line 25
Paylines 25
Reels 5
Risk game No
Multiplier Yes
Bonus rounds Yes
Scatter symbol Yes
Wild symbol No
Free spins Yes

About iSoftBet Software Provider

iSoftBet is a Malta-based studio and a part of the ISB Magma Group. The company has offices in London and Luxembourg too, and it operates all over Europe. iSoftBet is licensed by eight different agencies, including the Malta Gaming Authority (MGA) and the United Kingdom Gambling Commission (UKGC). All of the games of the studio are certified by Gaming Labs, iTechLabs, and QUINEL for fairness. iSoftBet develops table games, too; slots are not the only thing it offers. As of 2024, we can say that it is one of the largest and most successful developers in the iGaming industry.

Booster Pros & Cons

Pros Cons
A very high RTP percentage Some players may think that it lacks innovative features
Low volatility and excellent payout frequency Only one special symbol
Simple rules, easy to learn and play
Multiplier Free Spins bonus feature

Is Booster Slot the Right Game for You?

Classic slots always offer a pure slot experience. There are no features to track, symbols to learn, or rules that are too complex. You simply try to land the same symbols side by side and hope to trigger the bonus feature at some point. If this experience sounds good to you, the Booster video slot is the game you should play. We also recommend this game to beginners due to its simplicity and satisfying payouts. And if you like the experience, you should check out the Wild Wishes slot game too: it is very similar.

What to Expect from the Booster Slot Game?

The Booster slot game offers nice graphics but don’t expect amazing effects and animations. After all, this is the classic slots experience. There is no specific theme, but we can say that the game resembles the good old fruit machines with its symbols. Other than the mini-game that can award multiplier, Free Spins and cash prizes, the game has no unique bonus feature.

Booster slot machine bonus features

Bonus Features of Booster Video Slot

There is only one special symbol in the base game: bonus. Booster game does not include Wild or Scatter symbols. Landing 3, 4, or 5 bonus symbols anywhere on the screen during the base game will start the bonus feature.

  • The bonus feature is designed as a mini-game, and you can win one of the following prizes:
    • 6,000 coins
    • 5 Free Spins & 5x multiplier
    • 10 Free Spins & 2x multiplier
    • 10 Free Spins & 3x multiplier
    • 50 Free Spins & 2x multiplier
    • 15 Free Spins
    • 100 Free Spins
    • Random mystery reward
  • If you win multiplier and Free Spins (any of the multipliers and Free Spins listed above), the bonus symbol will act like Scatter during the feature and start to pay multipliers, no matter where it lands on the screen. 3, 4, and 5 bonus symbols will pay 2x, 15x, and 30x total bet, respectively.
  • However, you cannot re-trigger the Free Spins bonus during the feature.

Booster game bonus symbols

Booster Slot Game Payouts and Big Wins

The betting range of the game is flexible and can suit any budget. The minimum bet value is set at 0.25 coins. And the maximum bet amount is 25 coins per spin. The maximum payout in a single spin is 6,000 coins, but you can win much more than this amount during the Free Spins bonus because of the multipliers.


Whether you play real money or the slot demo game, the paytable is fixed. The winnings are calculated by multiplying the values from the paytable by the coin value. However, as mentioned above, this online video slot has multiplier Free Spins, so it would be best to play with the maximum bet value.

(*) This symbol also pays 5 coins even if you land only two.

Booster slot payouts

RTP & Volatility

You can play Booster video slot with an RTP percentage of 97.40%, which is well above the average. The game does not have official volatility info, but based on the paytable and our experience, we can say that the Booster video slot is a low volatility game.

Mobile Version of Booster Slot Game

The Booster video slot was released in July 2017, so while it is a classic slot, it is also a modern casino game. It supports HTML5 technology, which means the game can run on any browser regardless of the device and the operating system (iOS/Android/Windows, etc.). There is no need to download a program or use an application. You can start playing this game on your phone or any other device simply by clicking the play now button.

How to Play Booster Video Slot?

Start with checking the paytable. It explains all the symbols, rules, and bonuses. You can open the paytable screen by clicking the tiny “i” button at the bottom right corner of the interface.
Next, set the bet value per spin. You can do so from the section that says COIN VALUE. Don’t forget that the value you set here will be multiplied by the number of pay lines (25). You can now start the game. Click the big round button in the middle (or use the auto-spin feature).

Play Booster Video Slot with These Tips

  • The bonus feature of the game includes multiplier payouts. In order to maximize your winnings, we recommend playing Booster with the maximum bet amount.
  • Read our slot game review and try the slot demo game first before risking real money. You can play Booster video slot completely for free on SlotoZilla.
  • There are lots of online casinos that offer this online video slot. Pick the one with the best bonus (or simply pick one of our recommendations).

Playing Booster for Real Money

The free Booster slot is available on our website, and you can play it as long as you want. There are no feature or bonus restrictions in the Booster slot demo. However, we are sure that you will want to try this online video slot for real, too, at some point. When this happens, make sure to play at one of the online casinos below. We checked them all, and they offer the best bonuses for this game and all other classic slots developed by iSoftBet.

One of the Best Classic Slots Experience You Can Get

If you are looking for the good old classic slots experience, Booster is one of the best options you have. The base game is easy to play, and the bonus features are classic but fun – you can even win up to 30x total bet. We always think that classic games offer the pure slots experience and this video slot is the perfect example. Start with the Booster slot demo, and make sure to try your luck with real money too!

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