Nothing extra happens on a spin: lines are read left to right and three or more scatters start free spins. What you see on the reels is the whole story.
Lines, scatters and nothing else
Classic-line halls are the simplest machines in the museum. Each spin is read along fixed lines from the leftmost reel, and a line pays for three, four or five matching symbols in a row.
Wilds stand in for any symbol except the scatter. If a line could pay either as wilds alone or as wilds plus another symbol, it pays whichever is worth more.
Worked example. Three lighthouse lenses from the left on line one pay the three-of-a-kind value; a fourth on reel four would pay the four-of-a-kind value instead, never both.
