High completion percentage:
Click anywhere you want to make a line, but be sure at least one side will not be 
hit by a ball. Before the line touches, use the "Level skip" code and the percentage 
will be higher than 100% after the line connects. Note: You will not get full score 
for this -- only regular scoring will occur. 

Infinite Lives: 
During the game, type in "Lives". You should now have infinite lives.

Level skip:
Hold [Ctrl] + [Shift] and press [F12] during game play. This can be repeated as 
many times as needed, but will not give you any points. The last level is 49.