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Stack blocks to form groups of four or more like-colored blocks. Bricks can't be moved, but can be destroyed with dynamite. Move dynamite onto a column to destroy all the blocks in it. The bar on the top indicates when a new row of blocks will appear. Don't let the blocks reach the bottom of the screen or the game is over.
Move with your mouse. Grab blocks above you by clicking the left mouse button, and click again to stack them.