Twisted Lab RotoGrid: Slot Overview

Ever wonder if, in some alternate reality, the brains behind online slots would be hunched over forbidden books, chasing occult secrets and running experiments that could tear the universe apart? Probably not, yet the “mad scientist” angle remains a go-to in slot themes, and Hacksaw Gaming has delivered a particularly offbeat take on it. The game is Twisted Lab RotoGrid, and it gives the studio a perfect playground to blend some of its signature ingredients: oddball characters, expanding wild multipliers, and a nasty hold ‘n win/respin-style bonus.

A warped laboratory is absolutely the backdrop here. In this fractured world you meet Mr Melker and his sidekick Pat the Rat, while the mash-up of Hacksaw Gaming influences in Twisted Lab RotoGrid is neatly captured in the rhyme: “Five drops of Canny, Three spills of Crew, Slight hint of madness, Yummy Hacksaw brew!” It feels like the developers had plenty of fun putting Twisted Lab RotoGrid together, leaning into the neon-on-black punk look they’ve used to great effect before—think Chaos Crew 2—and pushing it into something even more deliciously twisted this time.

If you’re prone to motion sickness, staring at Twisted Lab RotoGrid’s rotating 5×5 gaming panel for too long might not be ideal. If the movement doesn’t bother you, then following the action across its 19 paylines is how you’ll keep tabs on winning combos, regardless of how the grid shifts. The game comes in multiple RTP versions, with 96.3% as the top return, and volatility sits at 4 out of 5, or medium-high. Stakes range from 10 c to $/€100, and there are also five bonus buy options available.

On the reels, Twisted Lab RotoGrid uses 8 pay symbols that feel part fitting, part weird: a feather, leaves, an egg, a mushroom, a piece of tentacle, an eyeball, teeth, and a brain. A five-of-a-kind pays 0.5 to 5 times the bet. Wilds come as beaker symbols—more on those shortly—so they can replace any standard pay symbol, and they pay 10x the bet for 5 OAK.

Twisted Lab RotoGrid: Slot Features

To start, here’s the new RotoGrid symbol, which can land carrying 1 to 4 ninety-degree clockwise rotations. Each charge makes the entire grid rotate by 90 degrees, opening up extra chances to land payline wins. Any wins from the first drop are paid out before the RotoGrid triggers.

Oozing Beakers

Whenever the RotoGrid rotates the grid, any Oozing Beakers on the reels shatter and pour their contents down to the bottom of the grid. Every position coated in Ooze become wild, substituting for all paying symbols. Purple Oozing Beakers carry no multiplier values. Blue Oozing Beakers can hold additive multipliers from x2 to x100. Pink Oozing Beakers can hold multiplying values of x2 to x10. If fresh Ooze lands over existing Ooze, the multiplier values are added together and then applied to all Oozing positions in the reel. When Blue Ooze combines with Pink Ooze, their multipliers are added together, and the resulting Green Ooze multiplier becomes multiplying. If Blue or Pink Ooze is combined with Purple Ooze, the multiplier from the Pink or Blue Ooze applies to the whole combined Ooze area on that reel.

Unleash the Ooze! Bonus Feature

You can trigger this in the base game by landing 3 FS scatter symbols. It begins with 10 free spins, and throughout the bonus there is an increased chance of landing RotoGrid symbols, FS symbols, and Oozing Beakers.

The Twist of the Twisted! Bonus Feature

This bonus starts when 4 FS scatter symbols land in the base game, granting 3 initial lives. During it, the reels change so that only Blue Twisters, Pink Twisters, Collect symbols, RotoGrid symbols, and non-paying symbols can appear. Each Twister shows Four multiplier values. The top value is the active multiplier. When the grid rotates, whichever value shifts to the top of the symbol becomes the new current value. Blue Twisters can show 1x to 1,000x. Pink Twisters can show 1x to 1,000x, or x2 to x10.

Blue Twisters spin along with the grid when a RotoGrid symbol lands. Pink Twisters rotate on each new free spin and also rotate an extra time with the grid if a RotoGrid lands. During the feature, there’s a chance to land the Collector symbol. Once it appears, it activates at the end of a spin, gathering the multiplier value of all Twisters on the grid. Twisters stay in place until the bonus ends or until they get collected.

The 3 lives are reset whenever new Twisters or Collectors appear. Each life equals one spin. When the feature finishes, the Twister and Collector values currently on the grid are added or multiplied together depending on each symbol’s value. The calculation runs from top to bottom, one reel at a time, left to right. If the first symbol is a multiplying multiplier, it is treated as an adding multiplier instead.

Bonus Buy

The bonus buy menu in Twisted Lab RotoGrid offers these 5 choices. Each one is classed as very highly volatile.

• BonusHunt FeatureSpins – 3x the bet, each spin is 5 times more likely to trigger a bonus game. RTP 96.28%.
• RotoGrid FeatureSpins – 50x the bet, each spin guarantees at least 1 Blue Oozing Beaker and 1 RotoGrid symbol land. Purple Oozing Beakers do not appear in this mode. RTP 96.32%.
• Oozing RotoGrid FeatureSpins – 75x the bet, each spin guarantees at least 2 Blue Oozing Beakers and 1 RotoGrid symbol land. Purple Oozing Beakers do not appear in this mode. RTP 96.27%.
• Unleash the Ooze! – 100x the bet. RTP 96.29%.
• The Twist of the Twisted – 200x the bet. RTP 96.33%.

Twisted Lab RotoGrid: Slot Verdict

Anyone who’s kept up with Hacksaw Gaming will already know how much the studio enjoys building mechanics around spreading wild multipliers—something it has showcased repeatedly over the years. You can spot it in plenty of titles, including Cursed Seas and others. Because it appears so often, the concept can occasionally feel a touch overfamiliar. Still, Hacksaw Gaming is clearly a creative outfit, and it regularly finds fresh angles for reimagining the idea. In Twisted Lab RotoGrid, that freshness comes through a two-part approach: an imaginative theme paired with genuinely inventive mechanics.

On the theme side, Twisted Lab RotoGrid also leans into another Hacksaw Gaming habit—bringing its games to life with quirky characters. Whether it’s buddy-style slots with Canny the Can and company, brawlers like Fist of Destruction, or the dance battle vibe of Feel the Beat, players are often joined by on-screen personalities in the studio’s releases, and this one is no different. The nice part is that the strange setting isn’t just there for laughs; the features are woven into it in a way that feels natural. The RotoGrid rotation mechanic and the Oozing Beakers—smashing and spreading their effects across the grid—fit the world perfectly. Watching multiple Beakers ooze into one another as the grid turns, setting up back-to-back wins, can be seriously satisfying. It’s smart design that combines several areas where Hacksaw Gaming tends to shine.

It’s strong on the technical side too, highlighted by a 15,000x the bet maximum win that can be hit in every game mode. Sometimes you can play a Hacksaw Gaming slot and, despite the polish, feel like they could have made it in their sleep. Other times—Twisted Lab RotoGrid being one of them—it’s a reminder of just how inventive the team can be when it really cuts loose.