Don’t spend any money
They made this game a play to play. It’s fun but most spending will not guarantee high returns for your money. Most purchases are a gamble on how many rewards you can get. Mine 90% of the time were the lowest reward. When you play to slowly unlock things you can still earn points to buy stuff, but if a glitch occurs and your weekly or monthly one time game isn’t working they will not give you that reward. They will just tell you to trouble shoot and not answer your requests.