About the Blocks Timer
Watch tetromino pieces drop in from above and stack to fill the screen exactly as time runs out. Unlike a normal game of Tetris, every placement is pre-planned: a backtracking solver figures out a complete tiling of the board before you press start, so the pieces land flush every time and the final image is a perfectly packed wall of color.
How It Works
The screen is divided into a tetromino-sized grid. Before the timer starts, the app finds a layout where seven tetromino shapes (I, O, T, S, Z, J, L) fill the board with no holes. Then it drops the pieces in order — bottom-up, left-to-right — at a pace that finishes exactly when the timer hits zero. Each piece visibly falls into its predetermined slot.
Perfect For
- Focus blocks — every piece is a small reward as it lands
- Classrooms — kids find the falling pieces engaging
- Gaming-themed sessions — perfect for board games and timed challenges
- Pomodoro work — 25 minutes of satisfying progress
Features
- All seven classic tetromino shapes
- Pre-planned tiling — board always fills perfectly
- Different layout every reset
- Preset durations and custom time input
- Audio alert on completion
- Fullscreen mode
FAQ
Why don't the pieces leave gaps like in Tetris?
Before you press start, a backtracking solver finds a layout where the tetrominoes pack the entire board with no holes. Then the pieces are dropped along that plan, so the final state is always a perfectly filled board.
Will I get a different layout each time?
Yes. The solver shuffles its candidate placements, so every reset produces a different tiling.
Is the blocks timer free?
Yes — free, no signup. Runs in any modern browser, desktop or mobile.
Can I run it in fullscreen?
Yes. Tap the Fullscreen button below the canvas; press Esc to exit.