Various embodiments of the present disclosure provide a gaming system and method providing a slot game including a symbol replacement feature. Generally, in various embodiments, the slot game employs a plurality of different symbols, each of which is included in one of a plurality of different groups. Each group includes at least two different symbols. In operation, the gaming system displays a plurality of the symbols and, if a triggering event associated with one of the groups occurs, the gaming system provides the symbol replacement feature by replacing at least one displayed symbol of that group with a different one of the symbols of that group. Thus, when providing the symbol replacement feature in these embodiments, the gaming system of the present disclosure replaces certain displayed symbols included in a particular group with different symbols included in that particular group and not with any symbols included in any other groups.