The Power of the Expanding Symbol
What really distinguished the game apart at launch was its special symbol. When the free spins round starts, the game randomly chooses one symbol to become an expanding symbol. If this symbol appears, it can stretch to cover a whole reel. This mechanic turns a single spin into a cascade of potential winning combinations. Paired with the chance to retrigger more free spins, it formed a template for tense, rewarding gameplay that players kept going back to.