Mystic Aztec

The Special Expanding Symbol is one of the most iconic and popular mechanisms in online slot history, a core free spins feature primarily found in 'Book of...' series games. The essence of this feature is that one regular symbol, randomly selected at the start of the free spins, gains a special power. This symbol, as long as it appears on the reels in the required number to form a win, will expand to cover its entire reel and create massive wins regardless of its position.

Persistent Symbol is the most powerful and valuable top-tier special symbol found in 'Hold and Respin' bonus rounds. The core of this feature, unlike a regular special symbol (e.g., a Collector) that activates only 'once' upon appearing, is that it repeatedly performs its special ability on every single respin until the bonus round ends. This 'persistence' is what pushes the game's potential to its absolute limit.