A method of gaming comprising: selecting a plurality of symbols for display at a plurality of display positions, the selecting being performed by selecting from a set of symbols including one or more modifiable symbols, each modifiable symbol adapted to receive a modifier; determining whether a corresponding modifier is a available for each selected modifiable symbol; modifying each selected modifiable symbol in respect of which a positive determination is made by adding the modifier to the modifiable symbol; and determining whether to make an award based on the plurality of symbols as modified.