Free spins and the total multiplier
Four or more Zeus scatters open 15 free spins. The grid works as before, but orbs behave differently: each one that lands in a winning sequence is added to a total multiplier shown beside the grid. That total is applied to every winning sequence from then on and never resets until the round ends.
Three or more scatters during the round add five spins and keep the total intact, which is how the biggest results happen. The round stops early if the 5,000x cap is reached.