A described gaming system implements an arrangement wherein, as part of a first base game instance, a gaming device is caused to include, at a first symbol position of a symbol array to be implemented by a gaming device, a first Wild symbol at a first symbol position on a reel of a plurality of reels; and, as part of a second base game instance following the first game instance, a modification of the reel of the plurality of reels is performed to move the first Wild symbol into a second symbol position different than the first symbol position.