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1 Reels 5
2. Paylines 25
3. Progressive No
4. Maximum coins 25
5. Jackpot 2000
6. Maximum jackpot in coins 2000
7. Multiplier Yes
8. Scatter symbol Yes
9. Free Spins Yes
10. Betting range from $0.25 up to $25
11. Coin Bet Range from $0.01 up to $1
12. Coins per line 1
13. Bonus Game Yes
14. Wild symbol No
15. Payout percent 97.20

If you've ever played older classic slots, then you know that there are certain motifs that come up over and over again with them. iSoftBet has tried to captures a lot of those concepts in their Booster video slot as a sort of throwback to those older styles of games. There are a number of symbols in this game that reflect on this older genre, but there are actually no fruit symbols in the game whatsoever. Instead, everything is based on trying to stand out by using other options from this sub-genre.

The graphics are pretty solid for the concept of the game, and they aren't overdone with 3D effects or anything like that. The end result is that you get a polished result that helps to give you an in-depth experience with smooth, relaxing gameplay based on giving value from the regular pay table.

Format and Layout

This game's format uses 25 paylines spread across five reels and three rows. The whole idea is to use older symbols and visual motifs in a more modern layout, and they are able to achieve that in a big way with 25 paylines. This is enough ways to win to make things interesting without there being so many that it's hard to keep up with what they actually are.

The betting is set up in a way that gives you enough flexibility to pick out bet sizes that work for you, but it's not over-complicated with too many options. All of the 25 paylines are fixed, and you can't change how many you're playing with. You are also forced into always betting exactly one coin on each of those paylines. However, you'll be able to pick from a variety of different coin sizes at various increments that run from $0.01 to $2 apiece. This means you can bet between $0.25 and $50 per spin.

The Purple Diamond Symbol

The purple diamond is one of the two most important symbols in the entire slot. It gives the biggest payouts that you can get from the regular pay table, and it is worth a huge 2,000x for five of a kind. It's also the only symbol in the Booster slot that will pay out for lining up just two of a kind. The win for four of a kind is 500x, which is also one of the bigger pays in the game.

Lightning Bonus Symbol

The bonus symbol is a bolt of lightning inside of a golden circle, and it appears on each of the five reels. You can get up to five at a time, but you only need three to trigger the bonus feature. This feature will give you another screen that randomly selects from various free spins options with multipliers or an instant win. The largest instant win you can get is 6,000x, which is larger than any of the pay table prizes, making it the single-largest payout in the game other than the 2,000x win for five diamonds if you get the 5x multiplier during free spins for a 10,000x total win.

If you get to a free spins feature, you'll see that the bonus symbol turns into a symbol that gives scatter payouts instead. This means you can't re-trigger the free spins, but you can get 30x for five of a kind of this symbol. You'll win 15x for four or 2x for three, and they can show up anywhere on the reels for these pays. These wins are multiplied by your entire bet, so they're pretty substantial payouts.

Other Wins and Prizes

Five of a kind of the lucky red seven is worth a 500x win. You can also score 200x if you line up five of the blue seven on a payline. The star is worth 150x for five, and the triple bar gives you 100x. You can win 75x for five of a kind of the double bar, and the win for five of the single bar is 25x. The pay table is mostly balanced with a tendency towards medium-sized wins, which helps this game to retain a fairly low overall volatility.


If you're the type of player who likes a smooth experience without a lot of swings, then the Booster slot by iSoftBet might be something that you enjoy. It has enough higher-end prizes to be interesting, but most of the wins are in the lower and middle levels, which balances out most of the volatility. The throwback theme isn't for everyone, but it's done well enough and without the fruit symbols that you almost always see in this sub-genre, so it stands out from the crowd quite a bit. We think there are plenty of players who would get a lot out of this game, but it's definitely made for those who enjoy a certain niche in terms of gameplay and slot style.

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