Knockout Diamonds Slot Review

Boxing meets fruit machine in the Knockout Diamonds slot, the eighth release in ELK Studios’ Classic Series of slot releases. This mash up is played on a retro 3 reel, 1 payline machine and comes with some heavyweight features. Trigger the Knockout Spins feature for 3 free spins. That number resets each time you land Knockout Diamonds symbols on the payline. Collect these symbols to win prizes which can get as high as 2,500 x stake. Landing matching symbols on reels 1 and 2 triggers the Ringside Rumble feature with those reels locking in place and the third reel respinning 3 times. Look out too for multiplier wilds. Find out more in our full Knockout Diamonds review.

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Knockout Diamonds Slot RTP, Details & Wager Limits

The action in the Knockout Diamonds slot plays out on a rather retro 3 reel, 1 payline machine. Land 3 matching symbols or wilds on that payline and you’ll create a winning combination. It doesn’t get much simpler than this.

You can enter the virtual ring at stake levels that start at 25p and rise to a maximum of £100 per spin. With an Autoplay function, you can choose from 10 to 100 autospins. In the Settings section, you can play with or without sound or music and also enable Quick Play.

The Knockout Diamonds RTP is 96% which is about average. The hit frequency rate is 12.8% so on average, you’ll land a winner around once every 8 spins. That means plenty of patience is required.

You’d expect a slot with a boxing theme to be a rather volatile one and Knockout Diamonds is. It’s not as destructive as peak era Mike Tyson but it can still pack a pretty hefty punch. The volatility is high. On a scale of 1 to 10, the variance here is about an 8. The most you can win from a single spin is 2,500 x total stake.

Theme – Audio & Design Features – get ready to rumble


Like the other slots in ELK Studios’ Classic Series, there’s an old school feel to the design in the Knockout Diamonds slot. With a boxing vs classic fruit machine theme, the reels appear like a vintage cabinet-style slot. The theme might be rather retro but the imagery is colourful, sharp and nicely put together.

On the reels you’ll find an assortment of classic fruity imagery. In order of value are cherries, single, double and treble bars, lemons and lucky 7s. The most rewarding symbol is the lucky 7 and pays 75 x your total stake if you land 3 of them on the payline.

There’s also a wild that can come with multipliers attached and the Knockout Diamonds logo which triggers the main bonus feature. The wild symbol pays 100 x your stake for 3 in combination.

You can try and land a knockout payday playing on a smartphone or tablet as well as on a desktop or laptop computer. The simple gameplay and crisp visuals work perfectly well if you’re playing a device with a smaller screen. The Knockout Diamonds mobile slot plays very nicely.

Knockout Diamonds Bonus Features

You’ll find a variety of extras which can pack a decent payout punch in Knockout Diamonds. They include multiplier wilds, re-spins and free spins.

Multiplier Wilds feature

As usual, the wild here substitutes for all the standard symbols when it makes up a winning combination. The wild can also come with a 2x or 3x multiplier attached which doubles or trebles your payout. This is known as the Multiplier Wilds feature. The only exception being the single and double cherry wins.

Ringside Rumble feature

The game’s Ringside Rumble feature triggers when you land matching symbols on reel 1 and 2. Those symbols are held and the third reel spins again 3 times, giving you more opportunities to land the all-important third matching symbol or wild and with it a winning combination.

Knockout Spins feature

To trigger the Knockout Spins feature, you’ll need to land 3 Knockout Spins logo symbols on the payline on the same spin. You’ll then go on to play 3 free spins where the goal is to try and collect as many Knockout Spins symbols as you can.

Each time you do land 1, the number of free spins resets to 3. The symbol is then added to a meter. The more you collect, the bigger the prize awarded when you’ve used up all your free spins. Prizes here start at 5 x your stake if you collect 3 Knockout Spins symbols.

If you manage to amass 10 of them, you’ll scoop the jackpot prize worth 2,500 x your total stake. That bumper payday is also awarded if you manage to land 3 Knockout Spins symbols on the payline on the same free spin. Here are the payouts on offer during the feature:

3 Knockout Spins symbols = 5 x stake 7 Knockout Spins symbols = 100 x stake
4 Knockout Spins symbols = 10 x stake 8 Knockout Spins symbols = 250 x stake
5 Knockout Spins symbols = 25 x stake 9 Knockout Spins symbols = 500 x stake
6 Knockout Spins symbols = 50 x stake 10 Knockout Spins symbols = 2,500 x stake

Knockout Diamonds Review Summary – simple slot that packs a decent punch

Like the other releases in ELK Studios’ Classic Series, you’ll find a retro theme, clean and crisp design and some decent features in the Knockout Diamonds slot.

The Knockout Spins feature is more like a streak respin bonus than a classic free spins round. They can deliver some decent action though, if you manage to collect a good selection of bonus symbols during the feature. The wild multipliers and respins also keep things ticking over.

The low frequency hit rate and the high volatility mean that you can expect some lengthy spells when your bankroll will hit the virtual canvas. Get lucky with the features and Knockout Diamonds can deliver some decent action. I’m not the biggest fan of fruit machine style slots personally. Unfortunately for ELK Studios, this game doesn’t deliver the knockout punch it intends to.

If you want more variety and innovation, the Nitropolis slot by ELK Studios takes you a post-apocalyptic world where Nitro Reels can increase the number of symbols to give you over 85 million ways to win. Another option is Visitors which can give you 4,096x multipliers in the free spins.

Knockout Diamonds FAQs

What is the Knockout Diamonds RTP?

The Knockout Diamonds return to player rate is 96% which is dead on average. However, it has a 12.8% hit frequency rate and is high variance so plenty of patience is needed.

What is the Knockout Diamonds max win?

The top payout is 2,500 x your total stake. This will arrive in the Knockout Spins feature where collecting 10 Knockout Spins symbols or landing 3 of them on a payline will result in this haul.

Is there a Knockout Diamonds free spins feature?

Yes. The Knockout Spins feature awards 3 free spins where the aim is to collect as many special symbols as you can. If you manage to fill the meter with 10 symbols, you’ll pocket a top prize of some 2,500 x stake.

What is the Ringside Rumble feature?

Land matching symbols on reels 1 and 2 and you’ll trigger the Ringside Rumble feature. With 3 respins awarded, you’ll have a shot at landing a matching symbol or wild on reel 3 and with it a new winning combination.

Knockout Diamonds Slot Information

  • Game:
    Knockout Diamonds
  • Provider:
    ELK Studios
  • Type:
    Video Slot
  • Reels:
  • Paylines:
  • Stakes Range:
    25p to £100
  • Bonus Features:
    Yes (3)
  • Free Spins/Multiplier:
  • RTP %:
  • Max Win:
    2,500 x
Review by Chris Taylor

Review by Chris Taylor

Chris is a slots expert that has reviewed and played over 4,000 online slots. Having being in the iGaming industry for over 16 years, he knows how slots work, how bonus features are triggered and how the RTP and variance affect the gameplay.