Known paytable, unknown next spin
Each spin fills the 6x5 grid with symbols, and free spins start when four or more SCATTER symbols land anywhere on it. How often the bonus round comes is not known in advance. The result of one session is random, whatever the RTP says.
Every spin on the 6x5 grid runs on one RTP version. Which RTP version runs here is shown only in the game rules, not on the reels. Read the rules before you play, because they are the only place where that version is named. The RTP figure applies to the long run, not to any single session.
Winning symbols vanish after each win and new ones fall in, so tumbles keep running for as long as new wins appear. The maximum win is a ceiling that players reach very rarely, so read it as a limit, not an expected result.