It's important to note that the slot Book of Ra does not have the cascading reels mechanic in its standard version. Cascading reels refer to the mechanism where symbols that form winning combinations disappear from the reels, and new symbols fall from above to fill the empty positions. This can lead to the formation of new winning combinations and consecutive payouts.
However, in the Book of Ra game, there is another interesting mechanic - expanding symbols. During the free spins feature, when a sufficient number of Book of Ra symbols appear, one symbol is randomly selected to expand to cover the entire height of the reel. This means that the chosen symbol can occupy multiple positions on the reel and create winning combinations on multiple active paylines.
The expanding symbol mechanic in Book of Ra can potentially lead to significant payouts during free spins, especially if the chosen symbol is a high-paying one. This makes the free spins bonus round particularly attractive to players and can be a key factor in achieving big wins.