Clear expectations for a single session
Symbols fill the 7x7 grid, and a cluster of five or more connected symbols pays. How often the free spins round starts cannot be known before you play. The result of one session is random, whatever the RTP, so two players with the same stake can finish with very different balances.
Every spin can chain several tumbles, with winning symbols removed and new ones falling in until no new win appears. Which RTP version is running is shown only in the game rules, so check that section before you choose a stake.
Multiplier Spots keep accumulating during free spins, doubling with each repeat hit up to x128, which is one route toward the top prize. The maximum win is a ceiling reached very rarely, so read it as a limit, not a likely outcome. The money figure moves with the bet you choose.