Endorphina

Crystal Skull

Slots Video Slots Aztec Action & Adventure Horror Mystery Jungle History Egypt Animals Ancient Ancient civilizations

An antiquities expedition shaped by crystal skull legends

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

96.1%

return to player

Volatility

—

variance

Max win

—

top multiplier

Min bet

$0.01

per spin

Reels

25 lines

Player rating

4.8 ★

2 votes

DEMO Play free, no signup

Endorphina

Embed on your site

4.8 / 5

2 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 & RTP9/10

RTP 96.1% → 9.0/10

Volatility8/10imputed

imputed medium (unknown) → 8.0/10

Win Potential—

no data

Features10/10

15 features → 10.0/10

Game Mechanics5.6/10

f=15 r=5 p=25 → 5.6/10

Context signals (tie-breakers)

Layout6/10

5x3 → 6.0/10

Bet Flexibility8/10

0.01–75 (×7500) → 8.0/10

Provider Reputation6.6/10

provider avg 6.6 → 6.6/10

Popularity6.7/10

synthetic proxy → 6.7/10

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: 79 — Crystal Skull by Endorphina

https://slotranker.com/endorphina/crystal-skull#score

How to cite

Slot Summary

A prize wheel can open the route to a separate treasure hunt in Crystal Skull, Endorphina's antiquities adventure slot. Its explorer searches for a final missing artifact, drawing on legends surrounding mysterious crystal skulls. That search carries into the bonus design, where concealed treasures turn the collector's story into a sequence of picks.

How It Plays

The crystal skull substitutes for other symbols except Bonus symbols. It appears on the middle three reels and expands vertically when that expansion completes a winning combination.

Scatter combinations use the skull differently: it can substitute for a Scatter without expanding, counting as a single replacement on that reel. Scatter symbols themselves pay regardless of position.

Theme & Atmosphere

An antiquities explorer is searching for the last crystal skull to complete an artifact collection. The premise gives the adventure a specific objective: finding a missing relic.

The story draws on legends that associate crystal skulls with mysterious powers and secrets attributed to ancient Mayan civilization. Those ideas supply the game's supernatural atmosphere rather than a historical reconstruction.

Aztec Action & Adventure Horror Mystery Jungle History Egypt Animals Ancient Ancient civilizations

Bonus & Free Spins

Three Bonus symbols on reels 3, 4, and 5 trigger the Wheel of Fortune. Its outcomes include bet multipliers or entry to the Treasure Hunt picking game.

Treasure Hunt presents five levels of concealed skull prizes. A pick can reveal treasure or a snake, with collected awards added together as the round advances through the available levels.

Spec sheet

Crystal Skull at a glance.

Identity

Slot nameCrystal Skull

StudioEndorphina

Released11/22/2022

Math

SlotRanker Score79

RTP96.1%

Max win—

Bet range$0.01 – $75.00

Player rating4.8 / 5 · 2 votes

Format

Reels5

Paylines25

Layout5x3

Expected average based on this slot's 96.1% RTP — individual sessions vary with volatility.

Bet per spin

Spins per hour400

Session length (hours)

Cost per hour$0.16

Cost per session$0.16

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 Crystal Skull? 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 (96.10%), 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 Crystal Skull

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Compare Crystal Skull with other games

	Crystal Skull Score 79This game	Ecuador Gold Score 83	Aztec Warrior Princess Score 68	Jenny Nevada and the Diamond Temple Score 67	Maya Quest Score 78
Identity
Studio	Endorphina	ELK Studios	Play'n Go	Rival Gaming	Nextspin
Released	11/22/2022	2/19/2019	5/10/2017	2/11/2025	8/10/2021
Math
RTP	96.1%	96.1%	96.69%	95.93%	96.84%
Volatility	—	High volatility	Medium volatility	—	Medium volatility
Max win	—	—	—	5,000×	37,500×
Format
Reels	5	6	5	5	5
Layout	5x3	6x4	5x3	5x3	5x3
Paylines	25	262144	20	20	20
Min bet	0.01	0.2	0.2	0.2	0.2
Max bet	75	100	25	20	300
Features
Progressive	—	—	—	—	—
Wild symbol	✓	✓	✓	✓	✓
Free spins	—	✓	✓	✓	✓
Scatter symbol	✓	✓	✓	✓	✓
Multiplier	✓	✓	—	✓	✓
Bonus game	✓	✓	✓	✓	—
Respins	—	—	—	—	—

Every number is shown as a delta against Crystal Skull.

Comparing against

Crystal Skull

Endorphina

RTP

96.1%

Max win

—

Score

Aztec Warrior Princess

+ Free Spins− Multiplier

Jenny Nevada and the Diamond Temple

+ Free Spins− Bonus Game

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