Endorphina

4 of a King

Retro Endorphina slot modeled on a formal Vegas casino

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%

return to player

Volatility

Medium volatility

variance

Max win

—

top multiplier

Min bet

$0.01

per spin

Reels

10 lines

Player rating

4.0 ★

9 votes

DEMO Play free, no signup

Endorphina

Embed on your site

4.0 / 5

9 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% → 9.0/10

Volatility8/10

medium → 8.0/10

Win Potential—

no data

Features4.5/10

6 features → 4.5/10

Game Mechanics4.2/10

f=6 r=5 p=10 → 4.2/10

Context signals (tie-breakers)

Layout6/10

5x3 → 6.0/10

Bet Flexibility6/10

0.01–5 (×500) → 6.0/10

Provider Reputation6.6/10

provider avg 6.6 → 6.6/10

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: 56 — 4 of a King by Endorphina

https://slotranker.com/endorphina/4-of-a-king#score

How to cite

Slot Summary

A five-reel grid with 10 paylines gives 4 of a King the profile of a compact casino cabinet rather than a feature-heavy modern release. Endorphina's 2014 game uses a 96% RTP, medium volatility, and a central Wild Symbol to support that direct approach. Its Retro, Romance, and Vegas themes present gambling as an evening at the tables.

How It Plays

Regular spins use a 5x3 arrangement and 10 paylines, keeping combination reading direct. The game does not depend on changing reel sizes or variable ways.

The Wild Symbol supplies the main interruption to ordinary payline results. Medium volatility keeps the mathematical profile between the low and high ends of the catalog scale.

Theme & Atmosphere

Retro Vegas imagery places the game at a formal casino table, with card play and sharply dressed gamblers defining its old-school direction.

Romance appears through the social side of the casino setting, giving 4 of a King the tone of an evening out rather than a solitary machine room.

Retro Vegas Romance

Spec sheet

4 of a King at a glance.

Identity

Slot name4 of a King

StudioEndorphina

Released11/15/2014

Math

SlotRanker Score56

RTP96%

VolatilityMedium volatility

Max win—

Bet range$0.01 – $5.00

Player rating4.0 / 5 · 9 votes

Format

Reels5

Paylines10

Layout5x3

Features

Themes

Expected average based on this slot's 96% 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 4 of a King? 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 (96.00%), 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 4 of a King

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Compare 4 of a King with other games

	4 of a King Score 56This game	Money Jar Score 87	Elvis Frog TrueWays Score 81	Diamond Bounty 7s Hold & Win Score 80	Runner Runner Megaways Score 78
Identity
Studio	Endorphina	SlotMill	BGaming	Kalamba Games	StakeLogic
Released	11/15/2014	8/9/2022	10/13/2022	8/9/2023	7/23/2020
Math
RTP	96%	96.09%	96.79%	96.01%	95.99%
Volatility	Medium volatility	High volatility	High volatility	—	High volatility
Max win	—	20,000×	5,000×	20,000×	23,653×
Format
Reels	5	5	6	5	6
Layout	5x3	5x5	6x6	5x3	6x3
Paylines	10	46656	262144	10	117649
Min bet	0.01	0.2	0.1	0.5	0.1
Max bet	5	30	50	50	40
Features
Progressive	—	—	—	—	—
Wild symbol	✓	✓	✓	✓	—
Free spins	✓	—	✓	—	✓
Scatter symbol	—	—	✓	—	✓
Multiplier	—	✓	✓	✓	✓
Bonus game	—	✓	✓	✓	—
Respins	—	✓	✓	✓	✓

Every number is shown as a delta against 4 of a King.

Comparing against

4 of a King

Endorphina

RTP

96%

Max win

—

Score

+ Multiplier+ Bonus Game+ Respins− Free Spins

+ Scatter+ Multiplier+ Bonus Game+ Respins

Diamond Bounty 7s Hold & Win

+ Multiplier+ Bonus Game+ Respins− Free Spins

Runner Runner Megaways

+ Scatter+ Multiplier+ Respins− Wild

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