When wins hit on a row, its multiplier increases by the number of winning symbols on that row. Each winning symbol equates to a multiplier increase of +1.

Look out for the Multiplier Boost symbol, which doubles the multiplier value of that row, while its more potent counterpart, the Epic Multiplier Boost symbol, multiplies all row multipliers by x2.

When you get one or more winning symbols on an active row, its row multiplier is applied to the win, and multiplier values are added together should wins include symbols from multiple active rows.

Try to avoid the dreaded Blackout Skull symbol, which deactivates the row multiplier where it landed until you get another Lightning Bolt to re-activate the multiplier.