Spinberry

Underworld Treasure

Slots Video Slots Mythology Underworld Darkness Treasure

Dark mythological multiway slot with linked lava features

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

93.17%

return to player

Volatility

—

variance

Max win

1,000×

top multiplier

Min bet

$0.10

per spin

Reels

4608 lines

Player rating

4.6 ★

12 votes

DEMO Play free, no signup

Spinberry

Embed on your site

4.6 / 5

12 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 & RTP5/10

RTP 93.17% → 5.0/10

Volatility8/10imputed

imputed medium (unknown) → 8.0/10

Win Potential6/10

x1000.00 (1000×) → 6.0/10

Features7/10

9 features → 7.0/10

Game Mechanics7/10

f=9 r=5 p=4608 → 7.0/10

Context signals (tie-breakers)

Layout5/10

5x5 → 5.0/10

Bet Flexibility8/10

0.1–250 (×2500) → 8.0/10

Provider Reputation5.3/10

provider avg 5.3 → 5.3/10

Popularity0/10

synthetic proxy → 0.0/10

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: 53 — Underworld Treasure by Spinberry

https://slotranker.com/spinberry/underworld-treasure#score

How to cite

Slot Summary

A 5x5 format with 4608 ways gives Underworld Treasure more room than a conventional fixed-line slot. Spinberry joins a dark Mythology and Underworld setting to a Lava Link sequence, Sticky Symbols in Free Spins, Random Multipliers and Fixed Jackpots. At 93.17% RTP, its identity comes from how those features pass value between the base game and bonus phases.

How It Plays

Winning combinations use 4608 ways across the 5x5 layout, so the base game reads through adjacent symbol combinations rather than a small set of fixed lines. Wild and Scatter Symbols provide the other routes away from ordinary outcomes.

When a Lava symbol lands, the Lava Link mechanic locks it and other Lava symbols on that reel for three paid spins. Completing the reel converts that collection into a multiplier or a Fixed Jackpot result.

Theme & Atmosphere

Darkness and Underworld themes give the game a severe setting, with lava serving as both the visual subject and the functional marker for its main link sequence.

Mythology and Treasure supply the wider context. The valuable objects are not merely decoration because the collection mechanic turns the search for treasure into a visible reel-by-reel objective.

Mythology Underworld Darkness Treasure

Features & Win Potential

Sticky Symbols matter most during Free Spins, where landed Lava symbols remain fixed for the rest of the round. Their persistence changes the value of later spins without replacing the 4608-way pay structure.

Random Multipliers and a Free Spins Multiplier add variable values to the feature rounds. Fixed Jackpots form a separate prize route when the relevant collection condition is completed.

Free Spins Multiplier Scatter Symbol Wild Symbol Multiway (+1024)Free Spins Multiplier Random multiplier Fixed Jackpots Sticky Symbols

Bonus & Free Spins

Three, four or five Scatter Symbols trigger 10, 12 or 15 Free Spins. During the round, Lava symbols become Sticky Symbols, letting later spins add to positions already secured.

After Free Spins finish, the Feature Respin choice offers a separate decision: keep the accumulated result or risk it for a chance to restart the feature.

Spec sheet

Underworld Treasure at a glance.

Identity

Slot nameUnderworld Treasure

StudioSpinberry

Released9/15/2025

Math

SlotRanker Score53

RTP93.17%

Max win1,000×

Bet range$0.10 – $250.00

Player rating4.6 / 5 · 12 votes

Format

Reels5

Paylines4608

Layout5x5

Features

Themes

Expected average based on this slot's 93.17% RTP — individual sessions vary with volatility.

Bet per spin

Spins per hour400

Session length (hours)

Cost per hour$2.73

Cost per session$2.73

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 Underworld Treasure? 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: Mediumassumed — not published for this slot

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 (93.17%), 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 Underworld Treasure

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Compare Underworld Treasure with other games

	Underworld Treasure Score 53This game	Hades Lost Treasures Score 84	River of Styx Score 79	Hades River of Souls Score 78	Amazing Legends Lucky Devils Score 77
Identity
Studio	Spinberry	Gold Coin Studios	Pragmatic Play	Fantasma Games	SpinPlay Games
Released	9/15/2025	4/8/2024	6/17/2024	6/9/2020	7/15/2024
Math
RTP	93.17%	96.23%	96.6%	96.56%	96.49%
Volatility	—	High volatility	Medium volatility	High volatility	High volatility
Max win	1,000×	10,000×	21,100×	5,058×	5,300×
Format
Reels	5	5	5	5	5
Layout	5x5	5x5	5x6	5x3	5x3
Paylines	4608	3125	—	10	20
Min bet	0.1	0.2	0.2	0.2	0.2
Max bet	250	25	125	50	50
Features
Progressive	—	—	—	—	—
Wild symbol	✓	—	—	✓	✓
Free spins	✓	✓	✓	✓	—
Scatter symbol	✓	✓	✓	✓	—
Multiplier	✓	✓	—	✓	✓
Bonus game	—	✓	—	—	✓
Respins	—	—	—	✓	—

Every number is shown as a delta against Underworld Treasure.

Comparing against

Underworld Treasure

Spinberry

RTP

93.17%

Max win

1,000×

Score

Amazing Legends Lucky Devils

+ Bonus Game− Free Spins− Scatter

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