A method of operating a feature game on a gaming machine having an interface, and a game controller having a processor and a memory storing instructions, which, when executed, cause the processor to activate the interface, the method comprising:
- generating, via the game controller, a first game instance formed from a first set of reel strips with a first symbol set, and a second game instance formed from a second set of reel strips with a second symbol set;
- generating, via the game controller, a first spin with a first game outcome for the first game instance and independently a second game outcome for the second game instance based on a random number generator;
- activating, via the game controller, a third set of reel strips based on a user input received at the interface, the third set of reel strips being different from the first set of reel strips or the second set of reel strips;
- generating, via the game controller, a merged game instance having a merged set of reel strips that includes the first set of reel strips and the second set of reel strips;
- generating, via the game controller, a second spin and a merged game outcome with the merged set of reel strips;
- and
- evaluating, via the game controller, whether the merged game outcome includes a winning outcome.