Stack master is a minimalistic, endless stacking game where your goal is to build the tower as high as possible by perfectly aligning moving blocks.
The graphics are simple and clean, focusing on smooth gameplay without distractions.
You compete globally for the highest score (tower height) on leaderboards.

When you start, a block (or “slice”) begins sliding horizontally across the screen at some height.
You tap the screen (or tap a control) to drop the moving block onto the block beneath it.
The better the alignment with the block below, the more of the block remains. If part of the block overhangs, the overhanging part is cut off.
If you drop with a slight misalignment, the excess portion is cut away and removed, making your next block smaller.
If your misalignment is very poor (i.e. almost no overlap), you might lose the block entirely, ending the game.
Each successful drop continues the tower upward. The goal is to stack as many as possible, reaching the highest possible height (score).
As the tower gets higher, it becomes more challenging. The blocks may move faster or require more precision. (This is common in stacking games of this type.)