Free spins rounds are almost always enhanced relative to the base game. The enhancements vary by title but cluster into a handful of well-established categories. Expanding wilds are common: in Book of Dead, triggering the free spins causes one randomly selected symbol to be designated as the expanding symbol for the round — on any spin where it appears, it expands to fill its entire reel. That expansion applies to all five reels simultaneously, meaning a single symbol can cover 15 positions at once.
Multipliers are the second major category. Some games award a fixed multiplier that applies to all wins during the free spins (Razor Shark applies 3× to all wins in its free spins round). Others use escalating multipliers that increase with each consecutive cascade or win (Gonzo's Quest's free falls reach 15× on the fourth consecutive cascade). Immortal Romance goes further, offering four distinct free spins modes — each tied to a story character — that differ in their multiplier structure, wild type, and retrigger probability.
Retriggers add duration uncertainty: if additional scatters land during the free spins, the counter extends. Some games cap retriggers; others allow unlimited extension. This is one of the primary sources of variance within the free spins format itself — the same trigger can produce a 10-spin session or a 60-spin marathon depending on retrigger frequency.
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