Everything you need to know about the controls, scoring, and mechanics of Stack Tower.
Go to the Play page. The game canvas loads immediately in your browser. No installation or account is required.
Click the Start Game button, tap the canvas, or press Space. The first block begins moving across the screen.
A coloured block slides back and forth above the tower. Watch its position relative to the block below it.
Tap the canvas, click with your mouse, or press Space / Enter / Arrow Down to drop the block at the current position.
The portion of the dropped block that overlaps with the block below lands on the tower. The overhanging portion falls away, trimming the block width.
The game ends when a block misses the tower completely — when there is no overlap at all. Your final score is shown on screen.
| Device | Input | Action |
|---|---|---|
| Desktop | Space bar | Drop the current block |
| Desktop | Enter key | Drop the current block |
| Desktop | Arrow Down | Drop the current block |
| Desktop | Mouse click on canvas | Drop the current block |
| Mobile / Tablet | Tap the canvas | Drop the current block |
| Any | Start Game button | Begin or restart the game |
| Drop Type | Points | Effect on Block Width |
|---|---|---|
| Normal drop (partial overlap) | Based on overlap width | Block is trimmed to overlap area |
| Perfect drop (exact alignment) | +15 points base | Block width stays the same |
| Perfect combo (consecutive Perfects) | +15 + (combo × 5) bonus | Block width stays the same |
| Miss (no overlap) | 0 — game ends | Game over |
Open the game and start stacking. Your high score is saved automatically.
Play Stack Tower