Stack!

How to play

Rules and tips

1. The game starts with a base of 3 blocks and an identical row sliding on top.
2. Press Space, tap the tower, or use the Drop! button to release the row.
3. Only the part that lands aligned with the layer below stays on the tower; the rest is cut off.
4. With each layer, the row gets faster. Lost all your blocks? Game over.
5. Stack 12 layers to complete the tower and lock in your local best score.

Arcade tips

• Watch the edge of the layer below, not the row: your click should land when the edges line up.
• The pace is steady within each layer: count one back-and-forth and drop on the second pass.
• With a single block left, centering is everything: better to drop early than late, since the cut is less forgiving at the end of the movement.

Controls by input type

• Keyboard: Space or Enter drops the row (with the board focused, or using the button).
• Mouse/touch: click or tap anywhere on the tower, or use the "Drop!" button.
• Screen readers: each stacked layer and each cut is announced in text.