Know the limits before the first spin
Three or more Torpedo Symbols anywhere on the grid start the Free Spins Feature, but the reels decide when that happens and nobody can predict it. How often the bonus round comes is not known in advance. The result of one session is random whatever the RTP, so a higher RTP version does not promise a better evening at the reels.
Each spin plays out on the 5x5 grid, and the RTP version running on this game is shown only in the game rules. Open those rules before the first spin and read the figure for yourself, because it decides the long-run return.
Multipliers climb through the Free Spins Feature, so a single round can pay far above its stake. The maximum win is a ceiling that very few rounds reach. Treat it as a rare outcome and set your budget for the stake, not for chasing the ceiling.