Series
Lucky Koi series
Spadegaming established the Lucky Koi series in 2018 with Lucky Koi, fixing its Asian fortune formula to a 5x3 grid, 20 paylines and a bonus structure built from wilds, scatters, free spins and multipliers. The founding Lucky Koi slot also includes turbo play, symbol substitutions during features and a gamble option, giving the original several ways to alter a conventional line game.
Ranked by Slot Score
| Game | Year | RTP | Volatility | Slot Score |
|---|---|---|---|---|
 Lucky KoiSpadegaming | 2018 | 96% | — | 70 |
 Lucky Koi ExclusiveLatestSpadegaming | 2022 | 96.52% | Medium volatility | 72 |
How the Lucky Koi series changed its bonus
Lucky Koi Exclusive grew from that base in 2022 without changing the grid or 20-payline structure. It concentrates the sequel around mystery symbols, additional free spins and a free-spins multiplier, while its 96.52% RTP edges above the original's 96% figure.
The word Exclusive does not signal a larger reel format. Its real distinction is bonus control: the sequel drops the original's emphasis on turbo and gamble options, then gives the free-spins round more opportunities to extend and modify results. That makes the pair a compact study in refinement rather than reinvention.