You should set your bet before you hit the reel. By clicking on "Bet", you can set the coin size, the number of coins per line and per line. The Coin Size button sets the coin denomination from 0.01 to 0.10. The Coin is used to set the number of coins per line you wish to bet, and the Line will set the number of lines. Rotate sets the reel motion and the AutoPlay option is used to rotate the reel a selected number of times without interruption.
5 KOI is the Wild symbol, which can form its own combination of combinations. This Wild symbol can replace all symbols except Scatter. The Scatter symbol can form a discrete victory, and once you hit 3 or more anywhere on the reel, you will trigger a reward selection. You can choose the Free Spins and Koi Bonus features.