Rotten Review

From Hacksaw Gaming

The zombie apocalypse is here in Hacksaw's darkest game to date showcasing their brand new SwitchSpins™ feature with respins and symbol upgrades. High, high risk with a 10,000x top win!



Name:  Rotten

Developer:  Hacksaw Gaming

Paylines:  35

Reels:  6

Rows:  5

RTP:  96.27%

Variance:  High

Top Payout:  10,000x

Jackpot:  No

Release Date:  December 2022

Features:  SwitchSpins™, Free Spins, Wilds

About This Slot

NOTE: Screenshots and Videos on this page are taken whilst we played this game for real money on Casumo Casino.

Just in time for Christmas, Hacksaw Gaming released their zombie horror slot, Rotten, on December 22nd 2022. It ended a thrilling year for this ambitious studio whose growing fan base enjoyed 20 diverse new games over 12 months from cute pug fun in Pug Life to eerie time-themed escapades in Time Spinners and Hells Angels antics in Outlaws.

Rotten sees Hacksaw enter the world of the Zombie Apocalypse and invoke a number of classic horror movie tropes including rampaging, blood-thirsty hordes, scary clowns, deserted fairgrounds, mad scientists and a gloomy, smog-covered backdrop. Pug Life this is not! Prepare to be scared!


Win or Bust? I Played Rotten … Here’s What Happened 

I played Rotten at Casumo with real money bets of 10p over a 60-minute session. Here is what happened.

  • Test Period: 60 minutes
  • Bet Size: 10p
  • Start Balance: £144.10
  • End Balance: £94.60
  • Win / Loss: – £49.50
  • Biggest Single Win: £25 (25x)
  • Biggest Losing Streak: 12 spins with no wins
  • Free Spins Round Feature Triggers: One
  • Free Spins Round Wins: 12p (17x)

They weren’t kidding when they classed Rotten as high variance. In my session this was one of the toughest Hacksaw games to date. Wins were infrequent and SwitchSpins™ were relatively rare. When they did land the outcome was never great, often ending with a dry re-spin. I never landed more than 25x in the base game.

The free spins round, shown in the video, triggered once. We started with 10 Mad Scientist Free Spins but upgraded to 10 Total Takedown with 3 TT scatters quite quickly. I even earned another 4 spins by landing an extra 3 TT scatters. The action switches to the front of a haunted house and the music cranks up with revving guitars, but still the zombies won out and I won very little. For all that, just a 17x from 17 free spins.

So, not my day, but I could see the potential in the SwitchSpins™ feature. The way to reach the big payout is to land consecutive SwitchSpins™ scatters on the re-spins and keep converting regular symbols into the clown or wild. That way you fill more of the grid with these symbols and create more high pay spins. Of course, in the Total Takedown round, that could be off the scale.

So, despite my losing run I would come back to this one. The theme is dark and it’s the kind of immersive high-risk slot that Hacksaw fans will love.


More About Rotten Slot

RTP, Variance and Top Payout

This is a highly volatile game, rated 5/5 by Hacksaw. That puts it right up there with its most volatile output like Itero Echo Spins or Hand of Anubis. Rotten has a surprisingly high hit rate of 33% and a variable RTP. Settings are between 96.27% and 88.03%. Casumo, where I played, ran Rotten at a disappointingly low RTP of 94.13%.

Symbols and Graphics

To score a win on Rotten you’ll need to land at least 3 identical symbols on the reels from left to right across one of 35 paylines. There are 5 low paying card symbols and 5 zombie symbols to help you.

The low payers, 10 through to Ace are valued at 0.1x for 3 tens on a line to 7.5x for six Aces. The premiums, including the terrifying highest-paying clown zombie are valued at between 1x for 3 of a kind and 40x for six of a kind.

There is also a Wild that subs in for all other symbols and has its own 50x payout if you can line up six on a payline.

What We Like

  Super scary theme for horror fans
  First SwitchSpins™ slot from Hacksaw
  High paying wilds - 50x for 6 on a line
  Symbol upgrades stick in bonus round
  Up to 10 respins with SwitchSpins™

What We Don't Like

  Not fun for scardey cats!
  RTP was low at Casumo - 94.13%
  Its a grim-looking game

Gameplay and Features

The gameplay in Rotten is all about the new SwitchSpins mechanic from Hacksaw Gaming but there are also TWO free spins rounds that may be triggered too.

SwitchSpins™ Re-Spins With Symbol Upgrades

In Hacksaw’s newly trademarked feature, triggered by landing a Switch Scatter, selected symbols are all transformed into the highest payer or wilds. Then between 1 and 10 re-spins play out.  It is possible to trigger more SwitchSpins™ by landing another Switch Scatter during the round. Now, further symbols are upgraded and more re-spins are awarded.

Mad Scientist Free Spins – 10 Spins

If you land the Mad Scientist Scatter 3 times in the base game you will trigger 10 free spins with enhanced odds of setting off SwtichSpins™.

Total Takeover Free Spins – 10 Spins

Total Takeover, triggered by landing 3 or more Total Takeover Scatters at any time during the base game or Mad Scientist round, gets you 10 free spins. The difference is, symbols upgraded by the SwitchSpins™ feature do not re-set when the re-spins end. In this way it is possible to entirely fill the screen with Wilds or the highest paying scary clown symbol.

Finally, note that it is possible to add a further 4 free spins in Total Takeover by landing 3 or more Total Takeover scatters.

More Games Like Rotten Slot

Mental by Nolimit City – Current kings of the horror slot and a game provider Hacksaw must have firmly in their sites, is Nolimit City. Mental is one of their creepiest yet, released in August 2021 and set in a mental asylum. Like Rotten it runs on a super-high variance, but offers a much, much higher top payout of 66,666x (what else?!) Mental is stacked with features including xWays, xSplit and xNudge Wilds.

Zombie aPOPalypse MultiPop by AvatarUX – For a slightly more humorous, if still gory, taken on the Zombie theme, try AvatarUK’s Zombie aPOPalypse Multipop with an equally dystopian backdrop but more comic book characters than horror show. You can score massive wins of up to 20,000x with free spins and infectious multipliers that spread across the board like a zombie infestation±

Where to Play Rotten Slot – Further Recommendations

Casumo – One of our favourite slot site right now is Casumo where you can gourge yourself on Hacksaw Gaming slots on their superb platform. You can even play them in tournament format, busting your balance to try to reach the top of the reel race leaderboards and win £1,000s in prizes. Get a 100% match up to £100 and 25 spins when you deposit £10 or more.

Play OJO – Alternatively, play at Skill on Net site, Play OJO. This site has 2,500 slots or more from providers as diverse as Hacksaw, Peter and Sons, NetEnt, Quickspin and 100s more. They also offer a 50 free spins sign up offer. Just deposit £10 to claim. Free spins come with no wagering requirements or win limit.

Our Verdict

Hacksaw Gaming move into the darker territory that Nolimit City have made their own with this release. It’s an atmospheric one for sure and the scary theme fits nicely with the super high variance that makes this slot not for the feint hearted. In my tests if was relentlessly tight, with no wins over 25x. However, the potential is there and a combination of consecutive SwitchSpins™ features in the Total Takedown round will make some lucky punters very happy indeed!



A dark and atmospheric horror slot that proved a horror show for the wallet in testing but has potential with the new SwitchSpins feature.