What is the RTP of Fusion Fever?

The in-game rules state a theoretical average RTP of 96.12%.

How do you trigger the Fusion Bonus?

Land 5 or more ENERGY symbols in the base game or during Bonus Spins. You get 3 Fusion Bonus spins, and each new symbol that locks resets them to 3.

How do Bonus Spins work in Fusion Fever?

Three BONUS symbols on reels 2 to 4 award 15 Bonus Spins. Energy symbols feed an Energy Collector, Multiplier symbols multiply it by x2 to x5, and the final collector value is paid at the end.

What happens when 4 Energy symbols land?

In the base game, exactly 4 Energy symbols activate the Multiplier, which multiplies their total by x2, x3, x4, x5 or x10.

What is the top Fever Wheel prize?

GRAND x5, worth 500x the bet, is the largest prize in the Fever table.

Does Fusion Fever have a bonus buy?

No bonus buy was offered in the demo, so the features have to be triggered in play.

Fusion Fever Guide: Rules, Energy Symbols, Fusion Bonus, Bonus Spins and Fever Wheel

By the CasinoDemo editorial team · Updated 2026-11-09 · How we review

Fusion Fever is a Fantasma Games slot set in a cartoon lab, with a mad scientist, three lab mice and a cheese Wild. It plays on 5 reels and 4 rows with 20 win lines, and its features all run on one thing: glowing ENERGY symbols that carry cash values.

We played the free demo at a 1 € bet for 150 autoplay spins and read every rules page. There is no bonus buy, and neither Bonus Spins nor the Fusion Bonus landed in our 150 spins, so those two parts are described from the rules only. We did hit the base game Multiplier twice, with real numbers below.

Play Fusion Fever demo for free

Fusion Fever at a glance

Provider: Fantasma Games
RTP: 96.12%
Volatility: Medium
Demo: Free, no sign-up

How Fusion Fever works

The grid is 5 reels by 4 rows with 20 win lines. Line wins pay from the leftmost reel to the right, only the highest win per line counts, and wins on different lines are added.

At a 1 € bet the paytable reads like this. The cheese WILD is also the top paying symbol: 50 € for five, 3 € for four and 2 € for three. The pink mouse pays 4 € for five, the green mouse 3 € and the blue mouse 2 €. A and K pay 1.50 € for five, Q and J pay 1 €.

Bets in the demo run from 0.10 € to 1,000 €.

Fusion Fever base game on a 5x4 grid with cheese Wild, lab mice and two Bonus scatter symbols, Grand 100x to Mini 10x shown on the left — Base game: 5x4, 20 win lines

Fusion Fever paytable showing Wild and mouse symbol payouts at a 1 euro bet — High pays at a 1 € bet

Special symbols

The WILD substitutes for all regular symbols.

ENERGY symbols are scatters with random values between 0.2x and 10x the bet. What they do depends on how many land in the base game: 1 to 3 give a random chance to activate the Fever Wheel, exactly 4 activate the Multiplier, and 5 or more trigger the Fusion Bonus.

The BONUS symbol lands on reels 2, 3 and 4 in the base game, and three of them trigger Bonus Spins. FUSION, FEVER and BLANK symbols only appear inside the Fusion Bonus, and the MULTIPLIER symbol only appears in Bonus Spins (reels 2 to 4) and the Fusion Bonus (all reels), with values of x2, x3, x4 or x5.

Fusion Fever base game with three Energy symbols worth 0.2 each landing on the reels — Three Energy symbols in the base game

The base game Multiplier

Land exactly 4 ENERGY symbols in the base game and their total is multiplied by x2, x3, x4, x5 or x10.

We saw this twice in 150 spins. The first time, four Energy symbols worth 0.6, 0.8, 0.6 and 0.8 added up to 2.80 € and got a x3, which works out to 8.40 €, about 8x the bet. The second time, symbols worth 0.4, 0.2, 0.2 and 0.2 made 1.00 € and the x4 orb turned that into 4 €. Small, but it is a nice extra in a base game where the line wins are low.

Fusion Fever Multiplier feature with four Energy symbols totalling 2.80 euro multiplied by x3 — Four Energy symbols: 2.80 € x3

Fusion Fever four Energy symbols totalling 1.00 euro with an x4 multiplier orb — Four Energy symbols: 1.00 € x4

Fusion Bonus

Land 5 or more ENERGY symbols in the base game or during Bonus Spins and you get 3 Fusion Bonus spins. The triggering Energy symbols lock in place and every other position becomes its own spinning reel. Only BLANK, FUSION, MULTIPLIER and FEVER symbols can land.

Each new FUSION symbol is worth the combined value of all Energy symbols on the trigger screen, which is why a strong trigger matters so much. MULTIPLIER symbols multiply the Energy and Fusion values. Any new Fusion, Multiplier or Fever symbol locks and resets the spins to 3. If every position gets locked, the Fever Wheel is awarded. At the end, all Energy, Fusion and Fever prizes are added up and paid. We did not trigger the Fusion Bonus in our 150 spins.

Bonus Spins and the Energy Collector

Three BONUS symbols in the base game award 15 Bonus Spins with an Energy Collector running. Landing 1 to 4 Energy symbols adds their combined value to the collector. Landing 5 or more triggers the Fusion Bonus, and whatever it pays is added straight to the collector. A MULTIPLIER symbol multiplies the current collector value by x2, x3, x4 or x5, so a multiplier late in the round can be worth a lot more than one early. When the 15 spins are over, the collector value is paid. We did not trigger Bonus Spins in our 150 spins either; we saw two Bonus symbols land several times but never three.

Fever Wheel and Fever prizes

The Fever Wheel can come from the base game (a random chance when 1 to 3 Energy symbols land) or from the Fusion Bonus. It spins and awards one Fever prize. The rules say the wheel does not represent actual odds.

The Fever prize table, in times the bet: MINI 10x, MINI x2 20x, MINI x3 30x, MINI x4 40x, MINOR 25x, MINOR x3 75x, MAJOR 50x, MAJOR x3 150x, MAJOR x5 250x, GRAND 100x, GRAND x2 200x, GRAND x3 300x, GRAND x4 400x and GRAND x5 500x.

RTP, max win and bet range

The game rules state a theoretical average RTP of 96.12%, calculated over 10,000,000,000 simulated rounds. The biggest single Fever prize is GRAND x5 at 500x the bet. The rules we read do not give an overall maximum win or a volatility rating, so we will not guess one. Our 150 spins at 1 € ended 107.50 € down, a single session and not an average. Bets range from 0.10 € to 1,000 €, and there is no bonus buy or ante bet.

Our verdict

Fusion Fever has a neat idea at its core: Energy symbols do different jobs depending on how many land, from a Fever Wheel chance up to the Fusion Bonus. The 4-Energy Multiplier gave us two small boosts, but the base game line wins are low and the two big features stayed out of reach in 150 spins. That is the trade with this one. If you like coin features that feed into each other, Bonus Spins with a growing collector is the part to hope for.

How to play Fusion Fever free in Canada

Press Play demo for free on the game page and the Fantasma Games demo loads with virtual credits. There is nothing to download, no account to create and no deposit to make, and it works in your browser on desktop and mobile.

Because nothing is at stake, the demo is the easiest way to learn how Fusion Fever's features trigger and how often it pays.

Playing Fusion Fever for real money in Canada

Real-money online gambling in Canada is regulated province by province. Ontario runs a regulated market where licensed operators are overseen by iGaming Ontario and the AGCO; other provinces offer play through their own provincial sites, such as PlayNow (British Columbia, Manitoba and Saskatchewan), Loto-Québec, PlayAlberta and ALC in Atlantic Canada.

The legal age is 19 in most provinces and 18 in Alberta, Manitoba and Quebec. Only play at sites licensed where you live, set limits before you start, and treat gambling as entertainment, never as a way to make money.

Fusion Fever FAQ

What is the RTP of Fusion Fever?: The in-game rules state a theoretical average RTP of 96.12%.
How do you trigger the Fusion Bonus?: Land 5 or more ENERGY symbols in the base game or during Bonus Spins. You get 3 Fusion Bonus spins, and each new symbol that locks resets them to 3.
How do Bonus Spins work in Fusion Fever?: Three BONUS symbols on reels 2 to 4 award 15 Bonus Spins. Energy symbols feed an Energy Collector, Multiplier symbols multiply it by x2 to x5, and the final collector value is paid at the end.
What happens when 4 Energy symbols land?: In the base game, exactly 4 Energy symbols activate the Multiplier, which multiplies their total by x2, x3, x4, x5 or x10.
What is the top Fever Wheel prize?: GRAND x5, worth 500x the bet, is the largest prize in the Fever table.
Does Fusion Fever have a bonus buy?: No bonus buy was offered in the demo, so the features have to be triggered in play.

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