Slots with expanding symbols
In the bonus round one symbol is picked as special and stretches across a whole reel whenever it lands in a paying position. The trick is familiar from the book games: Book of Ra and Book of Dead work exactly like this — ten free spins and a single card that decides the entire round. Giant 2×2 and 3×3 blocks that drop onto the grid as one piece and cover several positions at once belong here too.
How this slice was built
39 games out of the 996 in the catalog. The industry has no shared vocabulary for mechanics: studios describe the same thing in different words, so this list is assembled from a normalised set of spellings found in provider specifications — expanding symbols, expanding symbol, giant symbols, colossal symbols, mega symbols, mighty symbols. If a game uses the mechanic but the provider never listed it, it will not show up here.
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