An electronic gaming device comprising a display that displays a plurality of symbols in a plurality of symbol positions, a game controller that determines if the plurality of symbols include a trigger symbol, in response to determining that the plurality of symbols include the trigger symbol, controls the display to display the trigger symbol being transformed into a prize component symbol, incrementally animates a filling of a prize component of a first prize with the prize component symbol, and awards the first prize when a plurality of first prize components have been completely filled.