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If you’ve been spinning slots for a while, you know that 3×3 grids can be incredibly polarizing. They are usually either classic fruit machines or highly volatile beasts that will happily chew through your bankroll while you wait for one massive feature. Riddec Games’ August 2026 release, Ultimate KO, falls firmly into the latter category.
This comic-book boxing slot packs a serious punch with a 7,500x max win, it’s not going to be for everyone. Let’s step into the ring and break down why.
The Base Game Grind
Let’s get this out of the way early: the base game in Ultimate KO is brutal by design. You’re playing on a tiny 3×3 grid with just five fixed paylines. The symbol values are incredibly low, landing three premium red gloves or three hooded fighter Wilds will only net you 5x your bet. The card royals won’t even give you your stake back.
Because of the cramped grid, you’re going to see a lot of “near misses” where matching symbols fill the screen but somehow dodge all five paylines completely, paying absolutely zero. It can be frustrating, but it quickly becomes obvious that the standard symbols are just filler. The entire game revolves around one single mechanic: the VS tile.
The VS Expanding Wild: Thrills and Tilt
The VS tile is an expanding wild, but it comes with a snag: it only expands if doing so actually completes a winning payline. When it does connect, the game shifts into gear.
The tile stretches to fill the reel and reveals a red and a blue boxer, each assigned a random multiplier from a ladder that goes up to 100x. They duke it out, and the winning boxer’s multiplier is applied to your win.
Here is where the game will test your sanity: it shows you both multipliers before the fight. Watching a 100x multiplier get knocked out by a 2x multiplier is pure, unadulterated tilt.
It’s also worth noting how the math works if you land two VS wilds on the same win. The multipliers are added together, not multiplied. So, a 10x and a 20x will give you a 30x boost, not 200x. As a reviewer, I actually think this is a fair addition rule: it keeps the math grounded while still allowing the game to reach for that 7,500x max win cap.
The 5-Spin Bonus Round
Because this is a 3-reel game and scatters only land once per reel, the bonus trigger is rigid: you need exactly three scatters. Your reward? Just five free spins. No retriggers, no choices, no fluff.
While five spins sounds incredibly stingy, the round packs a wallop. The setting shifts to a gold-lit arena, and you are guaranteed at least one expanding VS wild on every single spin. It’s a very fast, high-stakes bonus round that will either pay out massive or leave you with very little in under a minute.
For the feature buyers out there, you can buy the bonus for 60x your bet. The fact that it’s priced this low tells you exactly how volatile those five spins can be. There’s also a “Lucky Bet” for 10x your stake that guarantees a VS wild on the next spin. A word of warning on this: the wild still only expands if a win is lined up. Don’t spam this button expecting guaranteed payouts.
Same Figures as Primal Fury
We have to talk about Riddec Games’ release schedule. If Ultimate KO feels familiar, that’s because it shares its board and its published figures with Primal Fury, which the studio released just a month prior.
It has the same slightly below-average 95.14% RTP, the same five paylines, and the same 7,500x max win potential. The theme swaps the prehistoric beasts for comic-book boxers. If you didn’t like Primal Fury, the boxing theme here may not change your mind.
However, if you love simple 3×3 grids and mechanics that build massive tension on a single spin, the VS Wild feature is undeniably exciting. It’s a game of sudden, explosive moments. Just make sure you manage your bankroll, because this slot is more than capable of delivering a first-round knockout to your balance.
