Box Fill: Color Puzzle

Box Fill is a color-matching puzzle about choosing the right moment.

The grid above is packed with colored blocks. The boxes along the bottom hold the marbles that clear them. Tap an open box and its marbles spill onto the conveyor belt, ride it up to the grid, and take out the blocks that match their color. Empty the whole grid to finish the level.

The belt is what makes it a puzzle. It holds limited marbles, and any marble that finds no matching block left stays on it, riding in circles and taking up room. Open the wrong box at the wrong time and the belt fills with marbles that have nothing to do. Jam it completely and the level is over.

How to Play
- Tap an open box at the bottom to release its marbles onto the belt.
- The belt carries them up to the grid, where each marble clears a matching block.
- Marbles with no matching block left stay on the belt and take up space.
- Clear every block in the grid to complete the level.

Why Order Matters
- Open a color the grid is nearly done with and those marbles have nowhere to go.
- The belt keeps moving, so a crowded belt is hard to recover from.
- Bigger grids use more colors and leave less room for a wasted release.

Boosters
- Pull any box and send it into the picture.
- Reshuffle the boxes when a level stalls.
- Add belt space when it gets tight.

Features
- Grids built as pictures that disappear block by block as you clear them.
- One-tap controls, no timer and no reflexes needed.

Read what the grid still needs, hold back the colors it does not, and keep the belt moving.

Download Box Fill now and see how many grids you can clear!