This is how the feature ends
The round continues until you stop landing volcanoes or until every single spot on the reel set is filled with fiery symbols.
Landing three, four, five, or nine volcanoes results in an immediate win. If you land six, seven, or eight, you'll enter a special mini-game: five ice floes appear, each with a different prize. A volcano then erupts, sending lava across the ice until only one floe remains. Whatever amount is on that surviving iceberg is yours.