Wild Stack Frenzy (Yggdrasil Gaming) – Review & Demo Play

The Wild Stack Frenzy Slot Game

I loaded Wild Stack Frenzy from Yggdrasil and got dropped into a crystalline cave packed with fossils and gems. The 5x3 grid runs on 20 fixed lines that pay both ways, and avalanches take over after every win. It looks tidy on mobile and desktop, with sharp animations and a drum-led soundtrack that kicks in when you spin. The set-up is simple to grasp, yet the stacked wild multipliers and cascading sequences add pace and the sort of swing I expect from this studio.

Symbols and Payouts in Wild Stack Frenzy

Wild Stack Frenzy uses a set of 10 symbols, all on theme. Low wins are stone-carved suits: Clubs in green, Spades in blue, Diamonds in purple, and Hearts in red. Five-of-a-kind pays up to 0.5x on these. High pays are fossils, with a Shell, Rib Bones, Claws, and Jaws topping the table. Land five and you get up to 1x, 1.5x, 2x, and 2.5x the bet. Wins count from left to right and right to left across the 20 lines.

The Wild Crystals act as substitutes for all regular icons and arrive as super stacked symbols. They tie into multipliers that climb as the stack grows, which I explain in the features section. Mushrooms are the Free Spins scatters and show up across the reels to trigger the bonus. Payouts are stake-linked, so the numbers scale with your bet size. With dynamic pays and both-way lines, even small clusters can chain together through avalanches for tidy base hits.

Wild Stack Frenzy Symbols and Paytable

Symbol	Quantity	Payout
	5	x2.5
	4	x1
	3	x0.5
	5	x2
	4	x0.8
	3	x0.4
	5	x1.5
	4	x0.7
	3	x0.3
	5	x1
	4	x0.6
	3	x0.3
	5	x0.5
	4	x0.3
	3	x0.2
	5	x0.5
	4	x0.3
	3	x0.2
	5	x0.5
	4	x0.3
	3	x0.2
	5	x0.5
	4	x0.3
	3	x0.2
	Scatter

Wild Stack Frenzy Slot Bonus Features

This slot adopts an Avalanche engine where winning symbols explode and new ones drop into the empty spaces. Each chain sits within the same spin and can keep rolling as long as fresh pays appear. Because the game pays both ways, you often see matches form from either edge after a drop. I’ve had rounds where two or three avalanches land back-to-back, and the total only tallies at the end, which keeps the pace lively without changing the stake.

Wild Stacks are the star. In the main game they cover 3 to 6 positions, with the bottom wild at 1x and the multiplier rising by one for each segment above it, up to 6x. During cascades there’s always a stack queued above a reel, ready to drop when space opens. In free spins, stacks can stretch to 10 symbols high, pushing the top value to 10x. Any win that runs through a stacked wild gets multiplied by the current value.

Free Spins trigger when 3, 4, or 5 Mushroom scatters land, awarding 7, 9, or 11 games on a richer reel set, with the chance to retrigger in the feature. The Buy Bonus is available at 60x the bet for an instant batch of 7 spins, subject to jurisdiction. With avalanches, both-way lines, and wild multipliers that can reach 10x, the game’s 5,000x stake cap sits within reach on a strong bonus, though you will need a bit of run-good.

How to Win at Wild Stack Frenzy Slot

After launch, you get a standard 5-reel, 3-row layout with 20 fixed lines paying both ways. Set a stake between £0.20 and £200, hit Spin, or use Autoplay with limits if that suits your session. Aim to chain wins so avalanches pull in queued Wild Stacks from above the reels. The menu holds the paytable, rules, and system settings, while the speaker icon lets you manage the audio. I like keeping bets steady and timing any feature buys.

Wild Stack Frenzy Slot RTP & Volatility

Wild Stack Frenzy runs at a 96% RTP by default, with other configurations at 94%, 90.5%, and 87% in some markets. Volatility is high, and the hit rate sits around 35%, so you can see chains of small wins punctuated by rarer spikes. The top payout is 5,000x the stake. Because lines pay both ways yet individual symbol awards are modest, balance can swing quite a bit; I pace wagers and look for bonuses where the wild multipliers do the heavy lifting.

The Final Thoughts on Wild Stack Frenzy

I’ve played a fair few cave and fossil slots, and this one stands out for the both-way lines mixed with avalanches. The visual polish holds up, but it’s the little bursts when wins blow off the grid that kept me spinning. Free spins feel lively thanks to taller stacks, yet even the base game can tee up nice ladders when an incoming stack drops into place. The feature set is tight, and every piece feeds the multipliers.

Do mind the swingy profile. Single-line awards are on the low side, so I tread carefully and let avalanches do the work, then look to press when free spins arrive. If budget allows, the 60x buy can shortcut the wait, but I only use it after a few test rounds in free play to see how the stacks are behaving. When the multipliers line up, Wild Stack Frenzy can punch, yet patience and stake control made the difference for me.