Bonus buy conditions are special conditions that only apply when certain prerequisites and requirements you define are met. For example, you could offer a price reduction if customers buy a certain quantity of particular articles at the same time or if they pay using a credit card.
Mystery bonuses can be triggered by randomly selected times, amounts of play or jackpot size. On games with skill-based bonuses, skilled players will do better than unskilled players, but do not have an edge on the house.