Forty-nine symbols on a seven-by-seven grid. 5 or more of a symbol touching side by side make a cluster and pay, by its size; then they burst, the rest fall and new ones drop in, again and again while there are clusters.

Every spot a winning symbol sat on is marked. A win on a marked spot turns it into a x2 multiplier, and every win after doubles it, up to x128; a cluster over multiplier spots is multiplied by them all added up. In the base game the spots clear every spin; in the free spins (3 or more scatters: 10 to 30 spins) they stay for the whole round.

It returns 94.5% of everything bet over time, measured over millions of spins. Each spin comes from your own provably fair seed pair the moment your bet is placed. Check any spin on the Provably fair page.