The web version of this game contains two different game modes with different goals:

Traditional mode: fill up the entire grid with puzzle pieces to advance to the next level.

Strategy mode: with every piece you place on the grid, the play area moves to the left. The unfilled areas of the grid will pulse red as they approach the left border of the play area. If any of the red areas go off screen, the game is over.

Left click the puzzle pieces at the bottom of the screen to pick them up, and click the grid to add the piece. You can use the spacebar to rotate a piece.

If you can't use a puzzle piece and there's no place left on the conveyor belt for new pieces, you can discard the piece. Just note that it will take some time before you can discard a piece again. In Strategy mode the grid moves to the left a bit with every discard.

You can speed up the arrival of new puzzle pieces by clicking 'Feed' at the bottom right. In Strategy mode you can click 'Scroll' to speed up the rate at which the grid scrolls from right to left.

Some tools to help you during playing:

wand: use the wand to automatically fill an empty part of the grid.

pick: use the pick to destroy a puzzle piece in the grid and thus clearing the way for new pieces. Please note that the pick is not available in Strategy mode.

If you fill up a part of the grid with a green star, you will earn bonus points.