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The Best Free Bonus Slots 

It should come as no surprise to anyone that the vast majority of online gamblers enjoy the slots. Whilst playing, they always have one eye open, looking for any freebies, incentives or bonus rounds. That’s because freebies can not only increase your playing time but by doing so, also increase your jackpot winning chances. So let’s take a look at all the essential information, including such things as the best casino operators, games categories, and tips, on how to play the best free bonus slots.

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Free Bonus Slots: Avalon II

Coming from the slots producer Microgaming, Avalon II is a slot with a mediaeval theme. Although the gameplay, graphics and symbols are really excellent, the standout feature is without a doubt the 8 bonus rounds. Because these can be triggered at random, it builds up the expectation for the player, thus keeping the adrenaline rushing through their veins. In fact, if you enjoy a good adrenaline rush, then go to King Billy Casino. They feature this legendary slot as it’s certainly one of the best free bonus slots games you can play online.

It’s the legend of King Arthur and his Round Table that is the theme to all 8 bonus slot features. An example of this is that during the Lake of Legends Bonus, you’re able to reforge the sword Excalibur. By doing so, you’re also building up a payout of up to 15x your initial wager. Those of you who love free bonus slots games which feature bonus rounds should put Avalon II up at the top of your list.

Pink Panther

Pink Panther

This slot from Playtech features the Pink Panther along with the legendary Inspector Clouseau. Here you’ll find 5 bonus jackpot games that can be triggered randomly. And it’s because of this random nature, that the bonuses could fall into your lap at any moment and on any given spin. This ups the ante as far as the excitement level goes. After all, there could be a free bonus slots round waiting for you at the next spin. Keep in mind that when you’re playing this slot you’ll also be entitled to any of the welcome bonuses or free spins that come from the reputable online casino you’re playing at.

When playing this slot, you’ll need to make some decisions that will affect the current gameplay, as well as your winnings. An example would be during the Pink Trail Bonus. Here you’ll be following in the footsteps of Inspector Clouseau. You need to decide whether you want to continue forwards with the chance of a bigger reward. Or, conversely, collect a smaller one along the way. But whatever decisions you make during the gameplay, we can assure you that the Pink Panther slot is it great playing experience.

Free Bonus Slots: Twisted Sister

If we head back to the 1980s, we can find the awful rock band Twisted Sister. It’s a shame we didn’t leave them there. Though they have thankfully disbanded, the game’s producer Play’n GO has decided to make a slot that pays tribute to them. As you’d expect there’s a rock theme with images of the dated band along with that terrible music as a painful soundtrack. But we’re not playing this slot necessarily because we are fans of Twisted Sister. Because we’re not! Nope, we’re here only for the bonus rounds!  As with the other slots in this list, these trigger randomly. There are three rounds: “Scream,” “Unite” and “Go Wild.”

Then there’s a painful “We’re not going to take it” feature in which an Angry Dad scatters overcharges at the Angry Meter. By doing so, your possible winnings increase by a factor of 1. Keep an eye open for the “Mega Band” symbol as it also functions as a multiplier for your winnings. Though we’re certainly not fans of the so-called music of Twisted Sister, we think that this free bonus slots machine is still worthwhile to play because its bonus features can prove very profitable allowing you a better possibility to win the jackpot online.

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King Kong Cash

Next up we have King Kong Cash, a slot from Blueprint Gaming. It’s a much more friendly version of the famous story from the pen of Edgar Wallace. So rather than making him the terrifying monster you might have seen in the movie of Peter Jackson, instead they’ve turned him into a cute and lovable gentle giant. What’s even funnier is that King Kong shows his sad disappointment if a spin doesn’t produce enough bonus symbols to trigger an actual bonus round. And talking of bonus features, the King Kong Cash slot has 5 of them.

Each of these bonuses comes through with the same specific advantages. For example, the Barrel Blast bonus features King Kong throwing golden barrels at the reels. These are then replaced by symbols to form winning combinations. Without a doubt, the King Kong Cash bonus rounds are certainly worth playing for. Another reason to play the game is the beautiful imagery. It makes the whole gaming experience more immersive and great fun.

Free Bonus Slots: Reactoonz


One of the most famous free casino slots that feature bonus rounds comes from Play’n GO. It has a typical 7×7 grid, which is similar to most online slots from this software developer. Let’s take a look at the amazing Reactoonz bonus features. The first stop is a bonus round is the “Quantum.” As with all the other bonuses in this list, it falls at random. Having said that, you’ll need to win at least 25 symbols before you have a chance of seeing it. There are 4 Quantum features that can be triggered by this. They are, “Implosion,” “Demolition,” “Alteration” and “Incision.” If you get through these features, then there’s the fifth one. This is a bonus called “Gargantoon.” With this, you receive a wild and a substitute for all symbols. It comes in the form of a 3 x 3 monster grid.

If you head over to King Billy Casino, you can try your hand at Reactoonz. If you happen to be a new player at this online casino, then there’s a smashing welcome bonus waiting for you of 151% up to €/$500 plus 51 Bonus Spins! This is a great way to get started.

Rainbow Riches

Every slots player knows Rainbow Riches for its plucky Irish theme. In fact, if you were to ask many slots players about slots featuring the Emerald Isles, then many would point to Rainbow Riches as their go-to slot. It’s a product from the games producer Barcrest. And it has all the symbols you’d expect including a rainbow. These include a pot of gold and, of course, an impish Irish leprechaun. One thing you’ll probably notice straight away is that the graphics and the audio of this slot do appear to be a little dated. But on the other hand, there’s a whole slew of slots players who love these types of themes from yesteryear. 

Rainbow Riches features 3 bonus features. This means that you will always be on your toes when you’re playing this slot. These bonus rounds are “Wishing Well,” “Pots of Gold” and “Road to Riches.” Once you trigger any one of these bonus features, then the idea of this free bonus slots machine is slightly out of date flies out the window. Simply because you’ll be concentrating on the possibility of earning some nice winnings.

How to Play Free Bonus Slots

online slot

One of the reasons we’ve highlighted these free bonus slots above is that if you were to look for good bonus jackpot slots online yourself, it may take you some time. It’s important that you do some form of homework when researching for the best free bonus slots to play. Furthermore, be sure to check the online casino you’re playing at thoroughly. For a start, it needs to have a reputable gambling licence. Preferably from a gaming authority like the UK Gambling Commission or the Malta Gaming Authority. You should also consider the bonuses that are on offer from each casino in turn. After all, receiving a tasty bonus before you even start to play the slots is going to help you even more. Especially when you win some bonus rounds with these slots as well.

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