Usually, it requires three matching bonus symbols. If the bonus launches are symbol-driven, then you must land a certain combination of symbols on the reels to go to the bonus. That's true regardless of whether you're playing online slots or offline slot machines. There are two basic ways: Activating a bonus round can be either symbol-driven or mystery driven. It's that possibility of winning without risk of losing that makes the event a 'bonus.' HOW DO YOU ACTIVATE BONUS ROUNDS?
You can accumulate credits during the bonuses without the risk of losing money, unlike regular spins. During the bonuses, you make no further bets.