Endorphina

Lucky Stamps

Emergency-service sticker collecting with separate service-specific bonus routines

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

96.08%

return to player

Volatility

High volatility

variance

Max win

3,200×

top multiplier

Min bet

$0.05

per spin

Reels

5 lines

Player rating

3.5 ★

7 votes

DEMO Play free, no signup

Endorphina

Embed on your site

3.5 / 5

7 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 96.08% → 9.0/10

Volatility9/10

high → 9.0/10

Win Potential7/10

x3200.00 (3200×) → 7.0/10

Features10/10

13 features → 10.0/10

Game Mechanics4.7/10

f=13 r=3 p=5 → 4.7/10

Context signals (tie-breakers)

Layout4/10

3x3 → 4.0/10

Bet Flexibility6/10

0.05–50 (×1000) → 6.0/10

Provider Reputation6.6/10

provider avg 6.6 → 6.6/10

Popularity5/10

synthetic proxy → 5.0/10

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: 74 — Lucky Stamps by Endorphina

https://slotranker.com/endorphina/lucky-stamps#score

How to cite

Slot Summary

For a compact slot with several distinct bonus routines, Lucky Stamps gives each emergency service its own activity. Endorphina draws on retro sticker collecting, connecting the ambulance, fire truck, and patrol car to different rounds. The small format accommodates separate approaches to extending spins, revealing prizes, and collecting values.

How It Plays

Emergency-light tokens appear only in the main game. They cover ordinary symbols, then reveal what lies underneath when they leave, allowing those uncovered symbols to contribute to winning combinations.

Wild symbols can appear stacked in both ordinary play and free games. They substitute for other symbols except tokens and bonus symbols, keeping their matching role separate from feature activity.

Bonus & Free Spins

Medic Free Games begins with 8 spins and a 1x multiplier. Each bonus symbol adds a spin and raises the multiplier by 1, with the increased value taking effect from the following spin.

Fire Pick’Em presents 12 flames concealing award symbols. Select flames until three matching awards have been revealed; that matching set determines the prize paid by the picking round.

Crime Hold uses police symbols that remain in position and collect values from criminal symbols. Its prize pool includes ordinary awards alongside the MIN, MID, MAX, and ULTRA jackpots.

Spec sheet

Lucky Stamps at a glance.

Identity

Slot nameLucky Stamps

StudioEndorphina

Released9/17/2026

Math

SlotRanker Score74

RTP96.08%

VolatilityHigh volatility

Max win3,200×

Bet range$0.05 – $50.00

Player rating3.5 / 5 · 7 votes

Format

Reels3

Paylines5

Layout3x3

Features

Themes

Expected average based on this slot's 96.08% RTP — individual sessions vary with volatility.

Bet per spin

Spins per hour400

Session length (hours)

Cost per hour$0.78

Cost per session$0.78

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 Lucky Stamps? 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: High

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 (High). The model is calibrated so the average return equals this slot's published RTP (96.08%), with wins capped at its top multiplier (3,200×).

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 Lucky Stamps

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 Lucky Stamps with other games

	Lucky Stamps Score 74This game	Lunar Rabbit Score 87	Fish Prawn Crab Bonanza Score 87	Festival 10K Ways Score 82	Oiran Dream Xmas Score 82
Identity
Studio	Endorphina	GameArt	Advant Play	ReelPlay	Win Fast
Released	9/17/2026	1/23/2023	7/29/2024	1/3/2023	11/15/2022
Math
RTP	96.08%	96.59%	97.02%	96.2%	96.34%
Volatility	High volatility	High volatility	Medium/High	High volatility	High volatility
Max win	3,200×	20,000×	20,000×	12,309×	2,300×
Format
Reels	3	7	6	6	5
Layout	3x3	7x7	6x4	6x4	5x3
Paylines	5	—	25	10000	5
Min bet	0.05	0.25	0.1	0.2	0.2
Max bet	50	100	10	1	350
Features
Progressive	—	—	—	—	—
Wild symbol	✓	✓	✓	✓	✓
Free spins	✓	✓	✓	—	✓
Scatter symbol	—	✓	✓	—	✓
Multiplier	✓	✓	✓	—	✓
Bonus game	—	—	✓	✓	✓
Respins	—	—	—	✓	✓

Every number is shown as a delta against Lucky Stamps.

Comparing against

Lucky Stamps

Endorphina

RTP

96.08%

Max win

3,200×

Score

Fish Prawn Crab Bonanza

+ Scatter+ Bonus Game

+ Bonus Game+ Respins− Free Spins− Multiplier

+ Scatter+ Bonus Game+ Respins

Explore More Games with Similar RTP

	Provider	RTP	Volatility	Max win	Score
Crystal Prince	Quickspin	96.04%	High volatility	11,630×	87
Nugget	AvatarUX	96.05%	High volatility	25,000×	88
Monkey Bonanza	Northern Lights Gaming	96.06%	High volatility	52,000×	87
Olympus Raging Megaways	iSoftbet	96.07%	High volatility	25,000×	87
Lucky Stamps	Endorphina	96.08%	High volatility	3,200×	74
JunglePop	AvatarUX	96.08%	High volatility	50,000×	88
Gluttony	NoLimit City	96.09%	High volatility	32,000×	88
Hypernova Megaways	ReelPlay	96.09%	High volatility	8,641×	80
Pond of Plinko	Print Studios	96.1%	High volatility	30,000×	91
Big Bucks Bandits	ReelPlay	96.1%	High volatility	10,000×	84
Chilli Bandits	SlotMill	96.11%	High volatility	15,000×	87