From the manual:
This program draws a balloon and sounds a tone when any key is hit. The balloons are a random size and color and are drawn at random locations on the screen. Each key is assigned a different tone (the user can play tunes by pressing the appropriate keys).
Hitting the down-arrow key causes the balloon to shrink until it disappears.
Hitting the up-arrow key causes the balloon to grow until it pops. After the pop, a rainbow is drawn and the first phrase of "Twinkle, Twinkle Little Star" is played.
English 
Comments and reviews
Bah, browser version doesn`t work well, but this was one of my favorite games as a kiddo
No comment nor review for this game at the moment.