Gaming device operating method e.g. for slot machine, involves generating primary set of symbols and virtual set of symbols, and replacing non-matching symbols in primary set with symbols in virtual set. Abstract: A gaming device which displays multiple results wherein subsequently displayed results are formed from previously displayed results...randomly generates and displays a first set of symbols...generates a second set of symbols... The gaming device compares the first and second set of symbols .... The gaming device displays the matching symbols and then displays the second set of symbols.