Various embodiments of the present disclosure provide a gaming system and method providing a slot game and enabling accumulation of graphical image symbols. Generally, in various embodiments, the gaming system enables a player to accumulate graphical image symbols during play of the slot game and, when a complete set of the graphical image symbols is accumulated such that a graphical image associated with that complete set is displayed, provides a feature to the player. The gaming system of the present disclosure thus encourages players to continue play of the slot game to attempt to accumulate a complete set of the graphical image symbols such that the gaming system provides the feature.