Stack ‘Em uses a cluster pays system where 5 or more matching symbols connecting vertically or horizontally create a win.
When this occurs in the base game, all non-winning symbols are removed, and the clusters drop to the bottom of the grid.
New symbols drop in, and if more winning symbols are added, the process repeats.
At the same time, the number of winning symbols on each reel creates an equal value multiplier, displayed at the bottom – up to 6x per reel.
Wins are increased by the total of the multipliers (up to x30), which are cleared between paid spins
