A not so numerous game feature but one that may be preferred by a select group of slot players is the Respin feature.
The feature is produced mainly by Microgaming and RTG. A Respin feature is different than a Free Spins Bonus Game in that when the feature is triggered (usually by 3 or more trigger symbols) the reels that triggered the re-spin are held in place while the other reels spin again.
Other slots include an actual button underneath a reel that says ‘re-spin’ with a value to respin that particular reel. Depending on the cost of respinning the reel that is holding up the payout, it might be worth it to pay to respin that reel.