Koi
Asian nature slot combining koi symbolism with cascading wins
The SlotRanker Score is calculated from the visible data below. It is not affected by affiliate deals, and it cannot be bought.
Why this score
Partial data (57%)Five weighted signals shape the composite. Four context signals refine ties. See how we rate for the full methodology.
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.
Slot Summary
How It Plays
Each paid spin checks 30 paylines on the 5x3 grid. A winning group disappears through the Cascading mechanic, and replacement symbols fall into the cleared positions.
The same cycle can repeat when the new arrangement wins again. This makes consecutive Avalanche results the central source of variation within an otherwise fixed-line format.
Theme & Atmosphere
Fish, Nature, Sea, and Asia themes converge on the koi subject, which is commonly associated with good luck and prosperity in Japanese culture.
The water setting gives the falling-symbol mechanic a natural fit, since symbols continually leave and refill the grid rather than remaining fixed after one result.
Features & Win Potential
Avalanche and Cascading wins remove every symbol involved in a payout before new symbols drop. The process continues whenever the replacement arrangement creates another win.
The Wild Symbol helps complete regular combinations, while the Scatter Symbol controls entry to Free Spins. Their roles remain distinct from the repeated cascade cycle.
Bonus & Free Spins
Free Spins award 8, 15, or 20 spins when 3, 4, or 5 Scatter Symbols land. Every win during the feature receives an additional 2x.
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Compare Koi with other games
 Koi Score 47This game |  Koi Gate Score 75 |  Koi Kingdom Score 74 |  Koi Koi Score 72 |  Fortune Koi Score 64 | |
|---|---|---|---|---|---|
| Identity | |||||
| Studio | |||||
| Released | 10/30/2019 | 2/12/2017 | 4/6/2018 | 9/26/2023 | 9/24/2024 |
| Math | |||||
| RTP | — | 96.26% | 98.08% | 96.5% | — |
| Volatility | — | Low volatility | Medium volatility | Medium/High | Low volatility |
| Max win | — | — | — | 3,750× | — |
| Format | |||||
| Reels | 5 | 5 | 5 | 5 | 5 |
| Layout | 5x3 | 5x3 | 5x3 | 5x3 | 5x3 |
| Paylines | 30 | 18 | 20 | 20 | — |
| Min bet | 0.9 | 0.18 | 0.2 | 0.2 | 0.1 |
| Max bet | 600 | 90 | 200 | 50 | 90 |
| Features | |||||
| Progressive | — | ✓ | — | — | — |
| Wild symbol | ✓ | ✓ | ✓ | ✓ | ✓ |
| Free spins | ✓ | ✓ | ✓ | ✓ | ✓ |
| Scatter symbol | ✓ | ✓ | ✓ | ✓ | ✓ |
| Multiplier | — | ✓ | — | ✓ | ✓ |
| Bonus game | — | — | ✓ | — | — |
| Respins | — | — | — | — | — |
Every number is shown as a delta against Koi.
Questions & Answers
Koi FAQ
Ameba developed Koi as a 30-payline video slot using fish, nature, water, and Asian thematic references.
Symbols in a winning combination disappear, replacements fall into the empty positions, and another payout can form before the sequence ends.
Landing 3, 4, or 5 Scatter Symbols awards 8, 15, or 20 Free Spins respectively.
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