Before the free spins begin, the game randomly selects one symbol from the paytable. This symbol becomes the Expanding Symbol for the entire round. When it appears on any reel during a free spin, it expands vertically to cover all three positions on that reel.
Here is the detail that catches many players off guard: expanded symbols do not need to appear on adjacent reels to form a winning combination. The game evaluates the expanded grid and pays across all active paylines. For example, if the Expanding Symbol is Rich Wilde and he appears on reels 1, 3, and 5 (skipping reels 2 and 4), the game still counts three Rich Wildes on any payline that crosses those reels.
Retrigger rules: During the free spins round, landing 3 or more Book scatters again retriggers the feature and adds another 10 free spins to the remaining count. According to independent slot trackers and multiple review sources, the retrigger is possible multiple times, though the practical frequency makes it a rare event.
The maximum win scenario: If Rich Wilde is selected as the Expanding Symbol and fills all 15 positions (5 reels x 3 rows), each of the 10 paylines delivers 5,000x the line bet. The net payout is 5,000x the total bet. The actual cash value depends on the casino's bet limit:
- At a $50 maximum bet: 5,000 x $50 = $250,000
- At a $100 maximum bet: 5,000 x $100 = $500,000
Both figures appear across different review sites (Casino.org cites $250,000 at a $50 cap; Casinos.com cites $500,000 at a $100 cap). Neither is wrong. They reflect different operator bet ceilings. Always check the maximum stake at your chosen casino before assuming a specific top prize.