Greentube

Diamond Tales: The Ugly Duckling

Slots Video Slots Fantasy Book Gems Animals Love Fairy tale

A fairy-tale transformation expressed through collectible hearts and chapters

Diamond Tales: The Ugly Duckling uses Random Bonus Symbols; 99.7% of the games we track do not.

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

95.04%

return to player

Volatility

High volatility

variance

Max win

50,000×

top multiplier

Min bet

$0.40

per spin

Reels

40 lines

Player rating

3.7 ★

20 votes

DEMO Play free, no signup

Greentube

Embed on your site

3.7 / 5

20 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 & RTP8/10

RTP 95.04% → 8.0/10

Volatility9/10

high → 9.0/10

Win Potential9.4/10

x50000.00 (50000×) → 9.4/10

Features10/10

18 features → 10.0/10

Game Mechanics7.5/10

f=18 r=5 p=40 → 7.5/10

Context signals (tie-breakers)

Layout6/10

5x3 → 6.0/10

Bet Flexibility4/10

0.4–40 (×100) → 4.0/10

Provider Reputation5.5/10

provider avg 5.5 → 5.5/10

Popularity7.5/10

synthetic proxy → 7.5/10

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: 80 — Diamond Tales: The Ugly Duckling by Greentube

https://slotranker.com/greentube/diamond-tales-the-ugly-duckling#score

How to cite

Slot Summary

Collect enough Diamond Hearts and the story moves toward its swan ending in Greentube's Diamond Tales: The Ugly Duckling. Created with RoyalCasino Denmark, the slot draws on Hans Christian Andersen's fairy tale and connects its seasonal chapters to changes in the bonus, making the transformation part of play.

How It Plays

Ordinary combinations pay along 40 lines, with matching symbols counted from the left. Only the highest award on each winning line pays, while wild substitutions can complete regular combinations.

Diamond Hearts accumulate in the Special Reel above their respective reels. Continued heart arrivals add to those collections; a spin without hearts transfers the collected values into the story meter.

Bonus & Free Spins

Snap Drop activates when its symbol reaches the fifth reel while the Special Reel contains Diamond Hearts. It awards a single respin containing heart multipliers, whose combined value determines the stake-based award.

Book Bonus symbols on reels 1, 3, and 5 trigger the Diamond Tales feature. Every Special Reel position receives an extra heart, and new Diamond Hearts reset the initial allocation of 3 spins.

Spec sheet

Diamond Tales: The Ugly Duckling at a glance.

Identity

Slot nameDiamond Tales: The Ugly Duckling

StudioGreentube

Released11/22/2022

Math

SlotRanker Score80

RTP95.04%

VolatilityHigh volatility

Max win50,000×

Bet range$0.40 – $40.00

Player rating3.7 / 5 · 20 votes

Format

Reels5

Paylines40

Layout5x4

Expected average based on this slot's 95.04% RTP — individual sessions vary with volatility.

Bet per spin

Spins per hour400

Session length (hours)

Cost per hour$7.94

Cost per session$7.94

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 Diamond Tales: The Ugly Duckling? 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 (95.04%), with wins capped at its top multiplier (50,000×).

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 Diamond Tales: The Ugly Duckling

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Compare Diamond Tales: The Ugly Duckling with other games

	Diamond Tales: The Ugly Duckling Score 80This game	Genie’s Link&Win 4Tune Score 87	Book of Magic Score 76	Ivan and the Immortal King Score 67	It's Magic: Lilly Score 64
Identity
Studio	Greentube	All For One Studios	Amusnet	Quickspin	IGT
Released	11/22/2022	4/25/2024	7/22/2014	11/29/2018	11/22/2018
Math
RTP	95.04%	96.24%	96.09%	96.29%	95%
Volatility	High volatility	High volatility	Medium/High	High volatility	—
Max win	50,000×	15,000×	10,000×	—	—
Format
Reels	5	5	5	5	5
Layout	5x4	5x3	5x3	5x3	5x4
Paylines	40	25	20	20	50
Min bet	0.4	0.1	0.01	0.2	75
Max bet	40	20	1000	100	15000
Features
Progressive	—	—	✓	—	—
Wild symbol	✓	✓	✓	✓	✓
Free spins	✓	✓	✓	✓	✓
Scatter symbol	—	✓	—	✓	✓
Multiplier	✓	—	—	—	—
Bonus game	✓	✓	—	—	✓
Respins	✓	✓	—	—	—

Every number is shown as a delta against Diamond Tales: The Ugly Duckling.

Comparing against

Diamond Tales: The Ugly Duckling

Greentube

RTP

95.04%

Max win

50,000×

Score

Genie’s Link&Win 4Tune

+ Scatter− Multiplier

+ Progressive− Multiplier− Bonus Game− Respins

Ivan and the Immortal King

+ Scatter− Multiplier− Bonus Game− Respins

+ Scatter− Multiplier− Respins

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01What do gold hearts do in The Ugly Duckling?

Gold Diamond Hearts multiply heart values during the Diamond Tales feature. Later story chapters introduce additional gold hearts into that feature.

02Can wilds replace the special symbols?

Wilds substitute for ordinary paying symbols. They do not replace Diamond Hearts, Book Bonus symbols, or the Snap Drop symbol.

03Can you buy the Diamond Tales bonus?

A Bonus Buy option provides direct entry into the Diamond Tales feature where that option is permitted and available in the game.

Series

Diamond Tales

View all 4 games

Game	Year	RTP	Volatility	Slot Score
Diamond Tales: The Ugly DucklingCurrentGreentube	2022	95.04%	High volatility	80
Diamond Tales: The Little MermaidGreentube	2023	95.04%	—	76
Diamond Tales The Princess and the PeaGreentube	2023	95%	Low volatility	70
Diamond Tales: The Emperor’s New ClothesLatestGreentube	2023	95.04%	Low volatility	72

Diamond Tales: The Ugly DucklingCurrent
Greentube · 2022
RTP95.04%Score80High volatility
Diamond Tales: The Little Mermaid
Greentube · 2023
RTP95.04%Score76
Diamond Tales The Princess and the Pea
Greentube · 2023
RTP95%Score70Low volatility
Diamond Tales: The Emperor’s New ClothesLatest
Greentube · 2023
RTP95.04%Score72Low volatility