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Expanding symbol

An ordinary paying symbol, chosen at the start of a feature, expands to cover its whole reel wherever it lands for the rest of that feature, but keeps paying only as itself rather than substituting for other symbols.

1 of 80 titles carry it · it is the headline feature on 1

What it does to your session

Written once for this mechanic, not per title.

Concentrates a feature's return in whichever symbol was drawn, so which symbol gets chosen decides a run's outcome more than the paytable's own value tiers do.

Also called

The names other studios and other sites use for the same thing.

Special Expanding Symbol · Expanding Special Symbol · Book Symbol

These resolve to this one entry. A studio’s trademark for a mechanic does not create a second mechanic, which is why a search for any of these names lands here.

Titles with this mechanic

The ones built around it first, then the rest.

Headline feature

Others in symbol behaviour

Grouped rather than listed flat, because a wall of feature names is not a filter.

What we do not have yet

Listed rather than hidden, so you can see the shape of what is missing.

How often it triggers

No studio here publishes a trigger frequency for this feature, so we hold none to print.

Market availability

We have not checked which markets remove this feature, and we do not estimate it.