One row
This is a sort of Tetris game.
You have to complete a row using the same type of bricks (you can choose the brick type with the slider). After you choose the brick clic OK to see what happens.
You can try again, but you will have a new tray, so maybe is not the same solution.
How many solutions are there for each case? Can you select the brick type that demands less bricks to fill the row?