The concept, originally implemented by Big Time Gaming on online slots like Extra Chilli, was simple – pay an upfront cost, and fast track your way into bonus rounds.
Prior to 2019, a bonus buy – or a bonus feature buy – was widely available on many slots in almost every jurisdiction. If you're a player without access to a bonus buy feature, there's every chance you aren't familiar with what they are. Tombstone RIP, by Nolimit City, Offers Players 2 Bonus Buy Options – 70x Bet and 3,000x Bet in Cost