Rotten slot review

What the Rotten slot is and who made it

Rotten is a Hacksaw Gaming slot from 2022. Hacksaw launched in September 2018, is headquartered in Malta and holds a Gambling Commission licence (reference 000-054059). Its parent, Hacksaw AB, has been listed on Nasdaq Stockholm since 25 June 2025. The studio is best known for Wanted Dead or a Wild, and Rotten follows a similar recipe: a compact base game, high volatility and a bonus that carries much of the value.

Figures are taken from the developer’s specification as listed on the casinos.com Rotten page (opens in a new tab). The only RTP that applies to you is the one shown in the game at your casino.

How the features work in Rotten

Rotten has two features, and they work at different stages. In the base game, SwitchSpins gives the reels a respin. The bonus is a two-part affair: a jar-pick round that leads into free spins. Both come from ordinary paid play on the 6 × 5 grid.

The bonus in order

1. A paid spin triggers the bonus.
2. The game shows a set of jars and asks you to pick.
3. What the jars reveal sets up the free spins that follow.
4. The free spins play out without charging your balance, and the total is paid at the end.

The pick stage looks like a decision, but the contents of each jar are fixed by the random number generator, not by where you tap. The value of the whole sequence is already part of the 96.27% top RTP, or less on lower versions.

SwitchSpins

SwitchSpins is a respin feature in the base game. A respin gives the grid another turn without a new paid spin, so it can add a win to a spin that would otherwise have ended quietly.

Our checked data names SwitchSpins but doesn’t say what triggers it or what changes during it. The same goes for the number of jars, what they can hold and how many free spins follow, so those details stay with the help screen. Since feature buys aren’t offered to British players, the bonus is reached only through normal spins.

Rotten RTP: why the version you play matters

Many studios supply the same game at several return settings and let each casino choose. For Rotten the top published figure is 96.27%, and lower versions are known to exist, though we have not been able to confirm their exact percentages. Other Hacksaw games show how wide the spread can be: 2 Wild 2 Die lists versions at 96.25%, 94.15%, 92.14% and 88.25%, and Slayers Inc at 96.28%, 94.36%, 92.40% and 88.22%.

The table below shows what different settings would cost per £100 staked. Only the first row is a confirmed Rotten figure; the others are illustrations to show the effect, not published Rotten versions.

The game looks and plays the same at every setting, so you cannot tell the version from the reels. A lower setting simply makes wins slightly smaller or rarer across the whole game. Each percentage point is worth £1 for every £100 you stake, which is why reading the help screen first is the single most useful thing you can do. Our UK RTP display rules page explains what casinos must show.

1. Open Rotten at your casino.
2. Tap the menu or information icon to open the game rules.
3. Find the line giving the theoretical return to player.
4. If it reads 96.27%, you have the top version; if it is lower, compare the cost using the table above.

The 6×5 grid and 35 paylines

Rotten has six reels and five rows, so 30 symbols show on each spin. Wins pay on 35 fixed paylines, each a set path across the grid. Compared with a ways-to-win game, a payline game asks matching symbols to follow specific routes rather than just appear on neighbouring reels.

As with any slot, the line count does not change the long-run return. Whether a game has 10 lines or 117,649 ways, the paytable is tuned so the RTP comes out at the published figure.

The jar-pick bonus, free spins and SwitchSpins

Rotten’s main feature is a bonus round in which you pick jars, and that pick round leads into free spins triggered in play. Pick-style rounds are one of the oldest bonus round formats. The picks feel like a choice, but in an online slot the contents are decided by the random number generator; no pick is smarter than another, and the overall return is fixed by the game’s maths.

The base game also has SwitchSpins, a respin feature. Hacksaw’s help screen sets out what triggers it and what changes during the respins. We have not been able to confirm those details from the developer, so we do not describe them further; check the game rules before you play.

If a bonus offers a pick, you are not using skill. Picking quickly or slowly, or always choosing the same position, makes no difference to what you win.

High volatility on Rotten: a £20 budget at three stakes

High volatility means results bunch up: plenty of spins return little, and the bigger outcomes come rarely, often through the bonus. Here is a simple view of £20 on the 96.27% version.

On a lower RTP version, the average cost of the same £20 would rise, for example to £1.20 at 94%. The swings, though, would be similar, and they dominate a short session. Our slot volatility guide explains why two players on the same game can have very different nights.

Rotten max win: 10,000x and what it means

The highest payout on one round is 10,000 times the stake. That is a common ceiling for Hacksaw’s high-volatility games and sits below the very large caps some studios advertise. The developer does not publish how often it is reached.

A lower ceiling is not a weakness in itself. It can mean a little more of the return is spread across mid-sized wins rather than locked into extremely rare outcomes.

Rotten against other Hacksaw slots

If Rotten appeals, these Hacksaw titles from our slot reviews have comparable profiles:

RIP City is the gentler option of the group, rated medium volatility. Chaos Crew 2 shares Rotten’s top RTP but reaches twice as high. As with Rotten, check which version each casino runs.

Rotten slot rules for UK players

Hacksaw supplies games to many markets, and some features you may see in footage from abroad are not offered in Britain. At UK-licensed casinos:

• Feature buy-ins are not offered to British players, following a Gambling Commission warning in January 2020; our feature buy page explains why.
• Stakes are capped at £5 a spin for players aged 25 and over and £2 for 18 to 24-year-olds, under the Commission’s online slots stake limit guidance (opens in a new tab) and our stake limits summary.
• Spins take at least 2.5 seconds, with no autoplay, turbo or slam-stop.
• Returns equal to or less than your stake are not celebrated, and net spend and time are shown as you play.
• The game rules and return to player must be available before you play, under RTS 3 (opens in a new tab).

How to play Rotten step by step

1. Set a deposit limit and a session time before you open any game.
2. Find Rotten in the casino’s game lobby.
3. Check the RTP in the game rules, as described above.
4. Read the paytable, the jar-pick bonus rules and the SwitchSpins description.
5. Choose a stake within your budget and the UK cap.
6. Spin one round at a time and stop at your limit.

Where to play the Rotten slot

Our partner offers below are for slots, but their spins are on Big Bass Bonanza or on selected games, and none is confirmed for Rotten. Check each casino’s game lobby for the title and, if you find it, the RTP version it runs. 18+ and terms apply.

• PlayOJO: new UK customers, excluding Northern Ireland, get 80 free spins on Big Bass Bonanza at 10p each with a first deposit of £10 or more; no wagering, and winnings are paid as cash.
• Coral: after depositing, bet £10 or more on slots for 100 free spins on selected games at 10p each, accepted within 48 hours and used within 7 days, with no wagering on winnings. Offer period 1 October 2026 to 1 February 2027; Neteller, PayPal, Paysafe, Skrill, prepaid cards and certain debit cards are excluded.
• Ladbrokes: deposit and spend £10 or more on slots for 50 free spins a day for 10 days (500 maximum), 10p each on selected games, claimed by 23:59 and valid for 7 days, no wagering. Prepaid cards, PayPal, Paysafe, Neteller and Skrill deposits don’t qualify.

LC International Limited runs both Coral and Ladbrokes, so holding new accounts at both may not be allowed. GamCare (opens in a new tab) and the National Gambling Helpline on 0808 8020 133 offer free support 24 hours a day.

18+. Every casino game has a built-in house edge, so over time you should expect to lose what you stake. Set a budget before you play and stop when it’s gone: safer gambling tools and support. Free, confidential help: National Gambling Helpline 0808 8020 133.