Koi Kingdom is a 5-reel, 3-row video slot with 20 fixed paylines. Winning combinations are achieved by landing identical symbols. Winning combinations start on the first reel on the left (excluding the BONUS Symbol) and run along to the last reel on the right. Any winning combinations are multiplied by the line bet. Only the highest winning combination of one symbol is paid out. Other combinations from the same symbol are rejected. Landing three or more BONUS symbols on the reels will trigger 12 Free Spins. After any line win (including three BONUS hits), all winning symbols disappear and new symbols fall from above the reels. The win multiplier increases with every new Cascade on both regular games and Free Spins. Cascade multipliers move up in the following steps: x1, x2, x3, x5.