Known rules, unknown rounds
Four SCATTER symbols anywhere on the grid start the Free Spins, but no one can say in advance how often that happens. Every spin is random, so the result of one session is random too, whatever the RTP. The RTP only describes what the game returns over a very large number of spins, not what one player wins.
Four RTP versions, from 96.50 to 96.55 percent, exist for Sweet Bonanza 1000. Which version Winshark Casino runs is shown only in the game rules, so read them before the first spin. The RTP table lists each version's return in money for A$100 staked.
25,000 times the bet is the highest win Sweet Bonanza 1000 can pay. It is a ceiling that very few spins ever reach, and no one can predict when, or if, a spin gets close to it. Plan each session around your own budget, not around the top win.