The Increasing Grid Size Feature might trigger once there has been no result or there are no more winning combinations on the screen. If it decides to activate, an empty row of symbols is added to the bottom of the reels. From here, reels number one and two could fall and add their symbols to the newly established reel. However, it could also be reel number three that makes its way down to the bottom of the screen. Then again, it could be reels four and five; it’s hard to tell and completely random!
In short, one of the reels will drop down and new symbols will fall into where it used to be. Once there is a new reel on the grid, the grid will have officially increased in size. Keep in mind that once all the tumbles from the spin come to an end, the grid will go back to its original format of five by five in size.