Futuristic
One of the newest inventions of Station Red is a special gambling machine. For every special symbol that lands on the reels the corresponding machine starts to spin. If the winning combination of 3 balls shows up, the corresponding special symbol and all his neighboring symbols turn into wild.
A different experiment that is carried out there is the winning series feature. If 6 symbols of the same kind appear, this feature is triggered. The symbols on the reels 1 & 5 are held until the feature ends. The spinning continues until more wilds or streaks appear or until all positions are filled with wild or streak symbols. They are held until the end of the feature.