Slot Machine
Slot Machines are a type of mini-game in Stardew Valley. They are found in the Casino.
The player can bet either 10 or 100 Qi coins when using a slot machine. If the results match one of the winning lines, the player receives a multiple of their bet. If there is no match the player loses their bet. Luck has an effect on gambling odds when using the slot machines.
The slot machines have a certain patterns that can be exploited. There are three patterns that occur successively in that order: 16 losses then W-L-W-L-W-L-W, 14 losses then W-L-W-L-W-L-W-L-W and 14 losses then W-L-W-L-W-L-W. The three patterns then repeat. By betting 100 when expecting a win and 10 when expecting a loss, you can quickly obtain enough Qi coins to buy an item from the shop.