Wait until you have three or more bonus symbols, which will activate additional spins. You can still win massive amounts of money with careful slot selection, even on the minimum bet. While many casinos are available to players in the US, most of these won’t be legal, licensed, or even regulated. You earn an extra free spin for each scatter landed during the bonus round and a full bonus re-trigger for 3 scatters, extending the bonus round feature and free spins indefinitely.