The Cluster Pays feature of the Stack 'Em slot machine is used on a 5x6 grid. Finding five or more matching symbols of the same kind anywhere on the grid is all that is required to win.
With the reels situated in a rural area and birds singing in the background, the Stack 'Em tune provides a nostalgic vibe. With Canny the Can to the right of the reels and Mona the mouse to the left, who has a striking resemblance to Mickey Mouse in his early years.
You can find some letters on the reels that pay less than other symbols. A leaf, a dead bird, a skull, a snake, and a thumbs-up sign bind these together. For positions 15–19 on the grid, the thumbs up symbol is the most profitable, paying up to 30 times your stake.
Anywhere it lands, the wild symbol substitutes for all other normal pay symbols to help you create winning combinations. In the base game, all non-winning symbols are eliminated from the grid when you land a winning cluster of five to twenty-five or more matching symbols. As long as you keep winning, more symbols will fall from above, and the process will repeat itself.
The multipliers that are generated below each reel by the winning symbol stacks that are kept are equal to the amount of symbols stacked on each reel. This may be monitored right beneath the reels, and a full reel will yield a multiplier of six. When a win occurs, the total of all reel multipliers involved is totaled up to a maximum of 30x (6x+6x+6x+6x+6x), and you begin anew with every new spin.
When three scatters appear anywhere in view within the same cascading sequence, you will enter the Bonus Round. First of all, you get five bonus spins, which appear as hearts above the grid.