What happens when I perfectly align a block?

A perfect placement triggers a rewarding chime sound effect and expands your block stability for higher scores.

What are the controls for Stack Rush?

Simply tap the screen or press the Spacebar / Down Arrow on your keyboard to drop each block.

Yes. Block traversal speed increases gradually as you climb past floor 10, 20, and 30.

Instant Play • 100% Free

Test your timing and rhythm by dropping sliding blocks atop each other. Any misaligned overhang is sliced off in real time as your tower climbs.

Play Stack Rush for a satisfying rhythm break that sharpens precision timing and spatial focus.

Input Controls: Spacebar, Down Arrow, mouse click, or mobile screen tap
Outputs & Scoring: Floor count, combo streak, local high score badge
Platform & Display: HTML5 Canvas, Web Audio API
Rules & Limits: Instant play in all modern browsers; high scores stored in local storage.

Tap the screen, click your mouse, or press Spacebar / Down Arrow to drop each sliding block.
Align the sliding block precisely with the block underneath to avoid losing surface area.
Chain 3 perfect placements in a row to expand your block width and restore stability.
Keep stacking as block speed increases until the block misses the tower completely.

Land 5 consecutive perfect placements to climb an ascending musical octave and widen the landing zone.

Maintain focus when block width shrinks down to a sliver to salvage a 40+ floor tower run.