This is brick battle. Double click the green flag. Type the difficulty 1-10 or use the slider. Move the paddle with the arrow keys or touch/mouse to hit the ball. Try to break all the bricks to win.
Based on atari breakout and other brick games. It can get SUPER hard on the high levels. Tell me if you've passed some of the high levels in the comments. 1-9 is possible but I'm not sure about 10. My highest in 10 is with one brick left!