All Star Knockout Ultra Gamble slot review

By Yggdrasil

All Star Knockout Ultra Gamble Slot

All Star Knockout Ultra Gamble Basic info

Game provider Yggdrasil

Release Date 7/2020

RTP 96.10%

Game Technology HTML5

Popularity Low

Min bet $0.20

Max bet $150

Max Win bet x 500

Gamble Feature Buy bonus game, Bonus game or special game, Bonus symbols, Freespins, Multiplier

Layout 5x4

Devices Desktop, Mobile

Configurable Winlines No

Volatility Low

Progressive Jackpot No

All Star Knockout Ultra Gamble is a modern take on classic fruit machines. The visuals and sounds keep true to the genre. But from the first spin of the reels you understand that there’s a lot more to this slot than a traditional pub fruity. All Star Knockout slot machine features a 5×4 layout, 20 paylines and low volatility. It also packs exciting features like an All Star Knockout Bonus, Random Bonus, Award Boards and a Gamble Feature.

With so many remakes of fruit slot machines, it is usually a hit or miss. Is the All Star Knockout slot just more of the same? Or is it a knockout as its name suggests? Continue reading this review to find out.

Theme and Graphics
The All Star Knockout online slot was developed by Manchester-based Northern Lights Gaming in partnership with Swedish developer Yggdrasil. The expertise show in Yggdrasil’s intricate visuals and Northern Lights’ understanding of the UK market, which has a long history of fruit machines. The word ‘retro’ is the first thing that comes to mind when you load the All Star Knockout online slot. The reels and buttons float in 3D on a blue backdrop, with a bright blue halo of rays and flying stars around the grid.

Juicy Fruit Symbols

Although the game symbols are traditional fruits, sevens and a high-paying KO symbol, they all look sharp with black background for the fruit and corresponding colours for the other symbols. The symbols of the All Star Knockout slot machine pay as follows:

  • KO: Max 5x with 5 on a payline.
  • Red 7: Max 4x with 5 on a payline.
  • White 7: Max 3x with 5 on a payline.
  • Blue 7: Max 2x with 5 on a payline.
  • Cherries: Max 1.5x with 5 on a payline.
  • Oranges: Max 1.5x with 5 on a payline.
  • Plum: Max 1x with 5 on a payline.
  • Lemon: Max 1x with 5 on a payline.

All Star Bonuses

Golden stars appear on the reels and fall into place on the Award Boards that are located below the grid. During Free Spins the backdrop cleverly changes colours to help you keep track of the current bonus round. The backdrop turns purple during Random and Low-Stars Bonuses, and Orange during the All Star Knockout bonus.

Retro Beats
Being so much more than background sounds, The All Star Knockout slot’s upbeat 80s tunes play a big part in the game’s theme. What more, when a bonus is triggered an announcer shouts ‘Yeah’ and ‘All Star Bonus’ to the cheers of a roaring crowd. The All Star Knockout cinematic music sends you back to a decade of synthesisers, shoulder pads and Miami Vice.


As the name suggests, the aim of playing All Star Knockout slot online is to collect all the starts on your way to a knockout bonus. To keep things simple there’s no Wild symbol, but there’s still a lot going on in the All Star bonus department.

Collecting Stars
Each symbol of the All Star Knockout slot machine has an Award Board with a place for 5 stars in it. When a star lands on the reels, it is posted on the Award Board of the respective symbol. Note that if you change the stake in the middle of a session, you will get empty boards and have to start collecting stars again. However your stars are saved for every session. So in case you go back to the previous bet level, you will still have the stars you collected before.

All Star Knockout Bonus
Once you collected 5 stars for on one of the Award Boards, the All Star Knockout Bonus is triggered. This bonus triggers 5 Free Spins as well as random multipliers of up to 5x on each spin. Most of the spins on the bonus rounds will yield multipliers of 2x or 3x, which is also a nice addition to potential earnings.

Random Bonus
As its name implies, this bonus will randomly trigger Free Spins after any spin during the base game. You will then get 3 Free Spins which will continue until a winless spin.

Extra Free Spins
You will still continue to collect stars off the reels during Free Spins. Filling an Award Board of an additional symbol will trigger 2 extra Free Spins and the symbol will be ‘knocked out’ for the remainder of the bonus game session. Eliminating high-paying symbols can possibly spoil your bonus returns, but it can also help you get rid of low-paying symbols.

Gamble Feature
If you don’t want to wait for Free Spins, click on the Ultra Gamble key to the left of the reels. This will open a new screen with a few wheels that you can spin to gamble for bonus rounds. If you manage to land the dial on green (there’s a 50/50 chance) you will win Free Spins.

I personally thought that the Gamble Feature was a bit detached from the All Star Knockout slot’s gameplay. The feature opens a new screen with wheels you need to spin, which distracts you from the reels. Furthermore as the Free Spins don’t have a Spin/Stop button, you just have to sit and stare at the screen until the bonus game is over.

Auto Spin
If you would like to sit back, relax and enjoy the funky 80s music while watching the reels spin, use the Auto Spin feature that can be set by total stake (different bets from 0.20 to 150 coins) or number of plays (different values between 10 and 1000). It is important still to always keep a close eye on your bankroll.

More Delicious Fruit Machines
For another fruit slot-machine with a cool twist, check out the Fruit Blast slot by SkillzzGaming. This fun-packed 5×5 slot machine also offers low volatility. And you have 9 aloha bartenders that serve you with juicy bonuses when you unlock reward levels.

Bets and Payouts

All Star Knockout Ultra Gamble is a 5-reel, 4-row slot machine with 20 paylines. Stakes range from a minimum of 0.2 coins to a max bet of 150 coins per spin. With a slightly-higher than average RTP of 96.09%, low volatility and a hit rate of 33.08% – The All Star Knockout slot aims to provide fantastic game sessions that are studded with frequent wins.

Keep in mind that along with lower risk, the All Star Knockout slot machine comes with lower winning potential than high-volatility slots. Still, the maximum payout of All Star Knockout is 4,503x your stake, which is pretty remarkable for a low-volatility slot. This means that if you are betting the highest stake available, you can win a knockout $675,450 in one spin!


The All Star Knockout Ultra Gamble slot machine carries on its back a dated theme. But with high-end design, exciting bonus features and the right mix of volatility, RTP and mechanics – All Star Knockout brings exciting new life to the fruit machine genre.

For old folks like me that were around in the 80s, the All Star Knockout slot is a great trip down memory lane. The younger generation of players will love the retro chic, fun bonus features and entertaining game sessions provided by this low volatility slot.

I had a fantastic time listening to the groovy music, collecting stars and enjoying knockout Free Spins and frequent wins. So whether the All Star Knockout slot will remind you of great times you had, or introduce you to great times you are too young to remember – I definitely recommend giving this game a spin or two. You won’t regret it!

Leticia Miranda

Leticia Miranda

Slot Games Analyst

Leticia Miranda is a former gambling reporter who knows everything about slot games and is happy to share her knowledge. She has covered a broad swath of topics and trends on gambling and is always full of new ideas and energy. Leticia also has a master’s degree in journalism from New York University and is passionate about writing.