A feature that awards an additional bonus (e.g., a multiplier) when all positions on the reels are filled with the same symbol.

Full Screen Bonus is a special payout rule that awards an additional bonus (usually a multiplier) on top of the standard prize at the visually most satisfying moment when all positions on the reels are filled with a single identical symbol.

The core of this feature is that it is distinguished from a regular high-payout win, as it is an 'achievement-based reward' given for accomplishing the special condition of 'filling the entire screen'.