A gaming system has a plurality of reels. Each reel has a plurality of symbol locations. The gaming system is in communication with one or more processors. The gaming system involves the selection of a symbol location on a first reel of the plurality of reels. The selected symbol location is associated with a first type of symbol. At least one additional symbol location is added to the first reel at a location adjacent to the selected symbol location. Each additional symbol location is filled with the first type of symbol to create a first clump of the first type of symbols. Alternatively, the gaming system determines a number of additional symbol locations that are added to the first reel adjacent to the selected first symbol location. The gaming system then fills the additional symbol locations with symbols.