Aruze Gaming

Ultra Stack Lion

Slots Video Slots Action & Adventure Nature Jungle Forest Animals Tiger Wildlife

Wildlife slot centered on Aruze Gaming's Ultra Stack format

SlotRanker Score

/ 99

05099

The SlotRanker Score is calculated from the visible data below. It is not affected by affiliate deals, and it cannot be bought.

How this score is built

RTP

97.95%

return to player

Volatility

Medium volatility

variance

Max win

—

top multiplier

Min bet

$0.50

per spin

Reels

50 lines

Player rating

3.9 ★

19 votes

DEMO Play free, no signup

Aruze Gaming

Embed on your site

3.9 / 5

19 ratings

User ratings are shown separately from the Slot Score unless stated otherwise.

Five weighted signals shape the composite. Four context signals refine ties. See how we rate for the full methodology.

Payouts & RTP10/10

RTP 97.95% → 10.0/10

Volatility8/10

medium → 8.0/10

Win Potential—

no data

Features6.5/10

10 features → 6.5/10

Game Mechanics5.1/10

f=10 r=5 p=50 → 5.1/10

Context signals (tie-breakers)

Layout6/10

5x3 → 6.0/10

Bet Flexibility2/10

0.5–5 (×10) → 2.0/10

Provider Reputation6.4/10

provider avg 6.3 → 6.3/10

Popularity3.3/10

synthetic proxy → 3.3/10

Popularity blends real player search demand (~30 markets) with a catalogue-derived proxy; games without measurable search demand use the proxy alone. Not live play telemetry.

Cite this score

SlotRanker Score: 67 — Ultra Stack Lion by Aruze Gaming

https://slotranker.com/aruze-gaming/ultra-stack-lion#score

How to cite

Slot Summary

Players who value a 97.95% RTP and medium volatility have a clear reason to examine Ultra Stack Lion. Aruze Gaming turns its wildlife theme into the game's central device: animal symbols arrive in long stacks, while the Big Cat Feature selects one of them for heavier representation across the free spins. The result is a lion-led slot where the theme directly shapes how combinations occupy the reels.

How It Plays

The base game evaluates wins across 50 paylines, with stacked animal symbols creating the possibility of several line combinations from the same reel arrangement. Wild symbols provide substitution support.

A separate Risk/Gamble game follows eligible wins, allowing the payout to be collected or placed into a double-or-nothing card choice. This side decision is distinct from the main stacking mechanic.

Theme & Atmosphere

Lion, tiger, and other large cats give the Animals and Wildlife themes a functional role rather than serving only as decoration. Their full-height appearances make the animal hierarchy easy to read.

The Jungle, Forest, and Nature framing keeps attention on the cats selected by the Ultra Stack system. It is a direct presentation with little narrative placed between the player and the reels.

Action & Adventure Nature Jungle Forest Animals Tiger Wildlife

Features & Win Potential

The Stack feature can place extended runs of one symbol on the reels, so a favorable selection may connect across several of the game's 50 paylines at once.

Wild and Scatter symbols have separate jobs. Wilds assist ordinary combinations, while Scatters open the Big Cat Feature. The Risk/Gamble game adds an optional decision after qualifying wins.

Free Spins Scatter Symbol Wild Symbol Medium volatility 5 Reels Additional Free Spins Risk/Gamble (Double) game Stack 50 Paylines 97% RTP

Bonus & Free Spins

Three Scatters start a selection game that assigns one animal as the featured stacked symbol, followed by 8 free spins in which that animal receives greater reel coverage.

The free-spins round permits Additional Free Spins when its Scatter condition returns. Retriggering extends the same selected-animal setup instead of resetting the feature around another cat.

Spec sheet

Ultra Stack Lion at a glance.

Identity

Slot nameUltra Stack Lion

StudioAruze Gaming

Released8/10/2022

Math

SlotRanker Score67

RTP97.95%

VolatilityMedium volatility

Max win—

Bet range$0.50 – $5.00

Player rating3.9 / 5 · 19 votes

Format

Reels5

Paylines50

Layout5x3

Features

Themes

Expected average based on this slot's 97.95% RTP — individual sessions vary with volatility.

Bet per spin

Spins per hour400

Session length (hours)

Cost per hour$4.10

Cost per session$4.10

Estimate only, for entertainment purposes — treat gambling as entertainment, not a way to make money, and set a budget you can afford to lose.

How long could a bankroll last on Ultra Stack Lion? We simulate thousands of sessions from this game's published RTP and volatility — the long-run math, not a prediction of your next spin.

Bankroll ($)Bet per spin ($)Speed

Volatility tier: Medium

Running simulation…

How this works

Each simulated spin either misses or returns a win drawn from a log-normal distribution, with the hit rate and spread set by the slot's volatility tier (Medium). The model is calibrated so the average return equals this slot's published RTP (97.95%), with wins capped at its top multiplier (1,000×).

This is a simplified, parametric model of the game's math — not its real paytable. It exists to make the house edge visible over many sessions, so the numbers above are averages across thousands of runs, never a forecast of one.

This is math, not a prediction. Real sessions vary wildly, and no strategy changes a game's built-in house edge. Play for fun, set limits, and never bet more than you can afford to lose.

Where to play Ultra Stack Lion

No matching casinos for your region yet

Casino availability depends on where you play from. We only show casinos that accept players from your country.

Compare Ultra Stack Lion with other games

	Ultra Stack Lion Score 67This game	Adventure Palace Score 75	Safari Sam Score 84	Jungle Spirit Megaways Score 80	Jungle Queen Score 80
Identity
Studio	Aruze Gaming	Games Global	Betsoft	NetEnt	BGaming
Released	8/10/2022	6/15/2008	10/26/2012	5/9/2024	2/20/2025
Math
RTP	97.95%	96.1%	97.5%	96.2%	96.15%
Volatility	Medium volatility	Medium volatility	Medium volatility	High volatility	High volatility
Max win	—	—	—	6,547×	10,000×
Format
Reels	5	5	5	6	5
Layout	5x3	5x3	5x3	6x7	5x3
Paylines	50	9	30	117649	20
Min bet	0.5	0.01	0.02	0.2	0.25
Max bet	5	45	150	100	25
Features
Progressive	—	—	—	—	—
Wild symbol	✓	✓	✓	—	✓
Free spins	✓	✓	✓	✓	✓
Scatter symbol	✓	✓	✓	✓	✓
Multiplier	—	—	✓	—	✓
Bonus game	—	✓	✓	—	✓
Respins	—	—	—	—	—

Every number is shown as a delta against Ultra Stack Lion.

Comparing against

Ultra Stack Lion

Aruze Gaming

RTP

97.95%

Max win

—

Score

+ Multiplier+ Bonus Game

Jungle Spirit Megaways

+ Multiplier+ Bonus Game

Explore More Games with Similar RTP

	Provider	RTP	Volatility	Max win	Score
The Lucky Pub	Play Labs	97.87%	High volatility	2,000×	76
Multi Golden Scarabs	Synot Games	97.89%	Medium volatility	2,000×	71
Lightning Spell	Synot Games	97.92%	High volatility	5,000×	72
Heaven Mania	Synot Games	97.94%	Low/Medium	1,120×	69
Ultra Stack Lion	Aruze Gaming	97.95%	Medium volatility	—	67
POP Royale	AvatarUX	97.96%	Medium/High	10,000×	78
Big Bass Boom	Reel Kingdom	97.97%	High volatility	5,000×	79
Gates of Heaven	Pragmatic Play	98%	High volatility	5,000×	84
Sweet Fiesta 1000	Pragmatic Play	98.01%	High volatility	25,000×	85
Bounty 98 Hot 1	Hot Rise Games	98.02%	Medium volatility	3,728×	78
Madame Mystique Megaways	Pragmatic Play	98.03%	High volatility	5,000×	86