Action Boost Gorilla Gems Slot Review
Three crystal bananas rest on stone altars above a bamboo-framed grid in a sunlit rainforest gorge, and the whole game is pitched at those altars. Action Boost Gorilla Gems doesn’t really have a bonus round; it has a bartering system, where the colour of gems you’ve accumulated decides which of three entirely different rounds you get, and how many of them stack together at once.
SpinPlay Games built it on a 5×4 grid with 20 to 40 paylines, a 96.39% RTP and medium volatility. The collection loop is the studio’s house style: Action Boost Tiki Treasures and Action Boost 3 Lucky Rainbows, both covered here in 2026, filled chests and pots the same way.
Gorilla Gems takes that build into the jungle, with a four-tier jackpot ladder stacked down the left edge as the fixed target. The reels’ job is to feed the altars. Everything interesting happens after they land.
Base Game & Features
The base game runs across a 5×4 grid with a fixed number of paylines between 20 and 40, depending on the feature in play. Wins pay left to right from the first reel, and only the highest winning combination counts on any single payline. Where multiple combinations land on one line, the top one takes the payout.
Stacked gorilla Wilds substitute for everything except the Banana Gems, and they can form their own winning combinations too. Bets run from 0.20 to 50.00 per spin, built from an initial bet multiplied by the payline cost. The reels are a conventional frame for an unconventional system.
Random Reveal Symbols
After all reels land, Random Reveal symbols flip over to become one of the game’s regular symbols. The full reveal set runs:
- Leopard
- Elephant
- Crocodile
- Python
- Parrot
- Royal Ace, King, Queen, Jack, 10 and 9
That alone would be a bit of extra variance. The important part is what else they can reveal. In the base game a Random Reveal can turn into a Green, Purple or Red Banana Gem, and the revealed position then behaves as both the regular symbol and a gem.
Every gem that appears collects to the altar of its colour above the reels. Whenever one or more Banana Gems appear, there’s a chance Banana Gem Free Spins trigger. The animation doesn’t influence the trigger, and the bet multiplier carries over from the spin that set it off.
The mix of colours that collects when the feature triggers decides which upgrades the free spins carry. One gem colour is a modest boost. Two or more on the same spin stacks them, which is where the round starts behaving less like a bonus and more like a different game entirely.
Action Boost Gorilla Gems Banana Gem Free Spins
Each gem colour carries its own upgrade, and the combination that triggers the feature determines what the free spins actually are. Gold Banana Gems appear only through Random Reveals during the round, and what they pay out depends on which upgrades are active. In short:
- Green – five free spins on a grown grid with full Wild reels
- Red – 10 free spins with the jewel collection and jackpot ladder in play
- Purple – five free spins with a random multiplier on every spin
Green Banana Gem Upgrade
Green gems award five free spins on a transformed grid. Every reel grows to a height of six symbol positions, the payline count rises to 40, and every Gold Banana Gem that lands pays a bonus credit prize. The grid change is the biggest structural shift in the game.
The sharpest edge is the nudge. Any reel carrying a Wild gets nudged until the entire reel is Wilds, with all wins paid after the nudges and reveals resolve. A grown grid with full Wild reels is the biggest swing Gorilla Gems offers.
Red Banana Gem Upgrade
Red gems award 10 free spins and put the jackpot ladder in play. Every Gold Banana Gem pays out a jewel or a bonus credit prize, and the jewels are collected by colour:
- MEGA – collect six Red Jewels – 5,000x the bet
- MAJOR – collect five Purple Jewels – 500x the bet
- MINOR – collect four Blue Jewels – 50x the bet
- MINI – collect three Green Jewels – 10x the bet
When a jackpot’s jewels are complete, that jackpot is paid and its jewel count resets, so a long round can clear the same ladder twice. The MINI needs just three jewels, which keeps the collection meter moving even when the bigger prizes stay out of reach.
Purple Banana Gem Upgrade
Purple gems award five free spins with a multiplier running throughout. Every spin carries a random multiplier of 2, 3 or 5, applied to all line wins and bonus credit prizes. The multipliers are drawn fresh each spin, so a big line win can land on a 5x through nothing but timing.
Every Gold Banana Gem awards one free spin, two free spins, or a bonus credit prize. It’s the upgrade most likely to keep the round alive, since the gems themselves feed the spin counter.
Multiple Banana Gem Upgrades
Upgrades triggered on the same base spin all apply to one shared round. If a Red gem is in the mix, the round pays 10 free spins; otherwise it pays five. The Purple multiplier applies to line wins and credit prizes throughout, but never to jackpots, which stand apart at their fixed values.
Our Honest Verdict
Overall Rating: 7.7/10
A session on Gorilla Gems is mostly spent in the gorge watching the altars, because that’s the game: the gems you’ve banked are the reason to sit down, and the reels are just how you bank them. When the trigger finally lands, it pays off properly.
The upgrade system is the best thing here, and it’s not close. Because the gem combination decides the round, no two bonuses feel like the same bonus, and the Green upgrade’s full Wild reels on a grown six-high grid is a swing this collection format rarely offers.
The cost is the spinning itself. Between reveals the base game has nothing to say, and the wait can be a long one. Jackpot hunters and collectors will feel at home in the jungle; players who want the reels to be the entertainment will find the altars fill slowly, and the waterfalls don’t talk.
Action Boost Gorilla Gems FAQs
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What is the RTP of Action Boost Gorilla Gems?
The overall RTP is 96.39%. -
Is Action Boost Gorilla Gems high volatility?
No, it’s a medium volatility slot, so wins tend to arrive at a steadier pace than in the high-variance end of the Action Boost range. -
How do the Banana Gem Free Spins trigger?
Banana Gems only appear through Random Reveal symbols. Whenever one or more gems appear, there’s a chance the free spins trigger, and each gem collects to the altar of its colour above the reels. The combination of colours that collects determines which upgrades the round awards. -
What do Random Reveal symbols do?
After all reels land, they reveal one of the game’s regular symbols, from the Leopard through to the royal cards. In the base game they can also reveal a Green, Purple or Red Banana Gem, and during the free spins they can reveal a Gold Banana Gem, with the position acting as both the revealed symbol and the gem. -
What are the jackpots in Action Boost Gorilla Gems worth?
The ladder pays 5,000x the bet for the MEGA, 500x for the MAJOR, 50x for the MINOR and 10x for the MINI. They’re won by collecting jewels during the Red Banana Gem Upgrade, and a completed ladder resets, so the same jackpot can be won more than once in a round. -
Can the Banana Gem free spins be combined?
Yes. All upgrades triggered on a single base spin play out in one shared round, so a Green and Purple combination runs the grown Wild-reel grid with the random multiplier attached. If a Red gem is included, the round pays 10 free spins instead of five. -
How many paylines does Action Boost Gorilla Gems have?
The base game plays a fixed 20 to 40 paylines, and the Green Banana Gem Upgrade runs on 40 lines across reels grown to six symbol positions. -
What are the betting limits on Action Boost Gorilla Gems?
Bets run from 0.20 to 50.00 per spin.
