Series
Diamond Tales series
Diamond Tales began in 2022 when Greentube placed The Ugly Duckling inside a 5x3, 40-payline fairy-tale slot with collection mechanics, a bonus wheel and a 50,000x ceiling. That foundation fixed the series formula: familiar literary stories on one reel chassis, with each adaptation changing the bonus mix or volatility.
Ranked by Slot Score
| Game | Year | RTP | Volatility | Slot Score |
|---|---|---|---|---|
 Diamond Tales: The Ugly DucklingGreentube | 2022 | 95.04% | High volatility | 80 |
 Diamond Tales: The Little MermaidGreentube | 2023 | 95.04% | — | 76 |
| 2023 | 95% | Low volatility | 70 | |
 Diamond Tales: The Emperor’s New ClothesLatestGreentube | 2023 | 95.04% | Low volatility | 72 |
Diamond Tales: The Ugly Duckling is the high-volatility starting point, combining free spins, random rewards, symbol swapping and bonus buying. Diamond Tales: The Little Mermaid followed in 2023 and redirected the collection loop toward Hold and Win, cash collection, random multipliers and level progression while keeping 40 paylines and the same 50,000x cap.
How the Diamond Tales slots changed their risk profile
Diamond Tales The Princess and the Pea made the sharpest mathematical change later in 2023. It moved the shared format to low volatility, retained free spins, collection and the bonus wheel, and narrowed the maximum bet to 4. Diamond Tales: The Emperor’s New Clothes also uses low volatility and a maximum bet of 4, but replaces the free-spins emphasis with Hold and Win and a gamble feature.
The line's purpose is adaptation rather than mechanical reinvention. The 5x3 screen, 40 paylines and 50,000x ceiling remain fixed, so the meaningful choice is between the high-volatility, feature-heavy opening stories and the lower-volatility royal tales that followed.
- The Ugly Duckling: the high-volatility foundation with free spins and random rewards.
- The Little Mermaid: Hold and Win, cash collection and level progression.
- The Princess and the Pea: the move to low volatility while preserving free spins.
- The Emperor’s New Clothes: low volatility paired with Hold and Win and gambling.