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Joker Gemferno Slot - Demo, Free Play, No Registration

Joker Gemferno is an online video slot game developed by Nucleus Gaming. Putting a twist on a classic fruit theme, this 18-betway slot benefits from multiple bonuses, f...ree spins, multiplier wilds, and a 7,500 top win. The RTP and variance of Joker Gemferno are unknown.

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  • Multiple integrated bonus games
  • Win multipliers
  • Up to 12 free spins
  • 7,500 top win
  • Unknown RTP
  • Unknown variance


From its multiple integrated bonuses to its win multipliers, free spins and decent 7,500 top win, this is a seriously impressive slot with a lot to offer. Nucleus Gaming slots have quite the reputation for immersive playing experiences, so let’s explore in a bit more depth precisely what is on offer here.

Theme, graphics & soundtrack

Although Joker Gemferno doesn’t have the most intricately designed layout we have ever seen, it still delivers just enough to hold the interest of even the most seasoned slot game players. If you are looking for a classic slot with a contemporary twist and don’t mind having a mildly scary joker companion throughout, Joker Gemferno is practically tailor-made for you. 

Players will find all the classic fruit symbols here, which have had a bit of a 21st-century upgrade. Additionally, players will see a selection of faceted gems on the paytable, alongside other symbols including red Xs and gold stars. The animations are seamless and the sound effects, whilst basic, do a good job of enhancing the in-game experience.

Joker Gemferno Slot - Demo, Free Play, No Registration

Joker Gemferno RTP and variance

Unfortunately, both the RTP (return to player) percentage and variance of Joker Gemferno are unknown.

How to play Joker Gemferno

  1. When the reels have loaded, most players will find it valuable to click the ‘i’ icon in the bottom left-hand corner of the screen. This will open a menu containing the paytable, rules of the game, and information about the bonus features.
  2. For players who want to customise their in-play experience, the speaker icon to the left of the ‘i’ icon will mute the soundtrack and sound effects.
  3. Setting the in-play stake is simple. First, use the - and + toggle buttons on either side of the line box to select the number of lines that should be in play; next, use the - and + toggle buttons on either side of the bet box in accordance with your budget.
  4. All that remains is to hit the spin button to start enjoying the game responsibly.

Bet sizes & paytable wins

Joker Gemferno has a 0.05 minimum bet and a 90.00 maximum bet, which should be enough variation to suit most playing styles.

To give you an idea of the level of wins available, let’s take a look at some of the highest-paying symbols on the paytable that will be in play throughout the base game:

5 x flaming red gem = 500
4 x flaming red gem = 375
3 x flaming red gem = 100
2 x flaming red gem = 7.50
1 x flaming red gem = 2.00

5 x flaming iridescent gem = 375
4 x flaming iridescent gem = 250
3 x flaming iridescent gem = 50
2 x flaming iridescent gem = 1

5 x gold star = 125
4 x gold star = 50
3 x gold star = 10
2 x gold star = 2.50

During the Gemferno bonus round, the paytable will change to look like this:

5 x blue gem = 750
4 x blue gem = 375
3 x blue gem = 75
2 x blue gem = 10

5 x pink gem = 500
4 x pink gem = 250
3 x pink gem = 50
2 x pink gem = 5

5 x yellow gem = 375
4 x yellow gem = 100
3 x yellow gem = 37.50
2 x yellow gem = 5

Joker Gemferno bonus features

Gemferno bonus round

Landing three orange Gemferno bonus symbols will trigger the Gemferno bonus round. In addition to seven free spins, players will have the opportunity to play with the special rainbow quartz symbols. 

Fruit Wheel

When the fruit symbol lands on reels three, four and five, players will have the opportunity to try their luck on the Fruit Wheel. This wheel can award up to 12 free spins and will award instant wins during every free spin.

Fire joker wild

When the fire joker symbol lands on the reels, it will substitute for all fire diamond symbols. Additionally, when the fire joker symbols pairs with a fire diamond symbol, it will evolve into a really wild symbol and deliver a 2x win multiplier.

If players land three stacked fire joker symbols, they will expand to create a fire joker reel. This could significantly increase the overall balance of the most fortunate players.

The integrated search filters here at Slots Temple make it simple for players to locate slots that will suit their playing style. If you are looking for a game with a specific theme or feature, such as expanding wilds or a free spins round, you won’t need to waste your precious playing time by endlessly scrolling to find a game that piques your interest.

Our verdict: Joker Gemferno review

If you don’t mind coming up against a slot where both the RTP and variance are unknown, Joker Gemferno has quite a lot to offer. From a decent paytable to a selection of bonuses and a strong theme, both new and experienced players are likely to find that this offering from Nucleus Gaming suits their playing preferences.

If you enjoy the premise of Joker Gemferno and are interested to explore some other games with a similar playing experience, we think you might like the Fire Joker free play slot from Play’n GO. This medium volatility slot has a 96 per cent RTP, an 800x top win, and a selection of additional features including re-spins, win multipliers, and a fun Wheel of Fortune-style bonus prize wheel.

Disclaimer: Joker Gemferno trademark / license is owned by Nucleus Gaming. This site is not endorsed by Nucleus Gaming.

Slot Data
Slot Name: Joker Gemferno
Software: Nucleus Gaming
Paylines: 18
Reels: 5
Min Bet (all lines covered): $0.36 (NZD)
Max Bet: $90 (NZD)
Top Win: 7500
Features: Bonus Game, Wild Symbol, Scatter Symbol, Free Spins, 5 Reels


What is the biggest win available on Joker Gemferno?

The most fortunate players could unlock a 7,500 maximum win by landing five blue gems in the Gemferno bonus game.

Does Joker Gemferno have a free spins bonus round?

Both the Gemferno bonus and the Fruit Wheel bonus symbols can trigger up to 7 and 12 free spins respectively.

Can you play Joker Gemferno on mobile?

Yes, Gemferno has been optimised for mobile devices.

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