This game mechanic, frequently found in video slots, involves symbols locking in place on the reels after a winning spin or when specific criteria are met. Subsequent spins may then add more matching symbols to the locked set, often increasing the payout or triggering bonus features. A common example is a game where matching symbols adjacent to one another lock, creating a larger cluster and awarding a re-spin.
This feature enhances player engagement by introducing an element of anticipation and the potential for escalating wins. It adds a layer of strategy beyond simply spinning the reels, as players consider the possibility of linked symbols and the resulting rewards. Originating in the digital era of slot machines, this mechanic has become a popular addition, contributing to the evolution of game design within the casino industry.