Known from the rules, unknown from the reels
Scatter symbols land at random on the 6x6 grid, so how often the Free Spins round comes is not known in advance. One session may bring no bonus at all, or several. The result of any session is random whatever the RTP, because RTP describes an average over a very long run of spins and does not predict the next one.
Every spin on the reels pays out under one RTP version, and the three versions sit close together. Only the game rules say which version runs here, so check that line before you bet. A version with a higher RTP still does not promise a win in any single session, since the gap between versions is small.
Cluster wins are multiplied by the WILD METER of the columns they touch. In Free Spins the meter keeps building from spin to spin. The maximum win is a ceiling reached very rarely, so treat it as the top of the scale, not as an expected result.