The word guarantee covers two very different promises. In most modern titles it means guaranteed entry, obtained by paying the purchase price and skipping the trigger entirely, while in a smaller group it means a feature that must arrive within a fixed number of ordinary spins, whatever the reels have done in the meantime. Both count as slots with guaranteed bonus round mechanics, yet they feel nothing alike: one is instant and expensive, the other slow and capped. The rules screen makes clear which promise a game is making.
