On the password screen tipe the following passwords: k00ky for making the ball go nuts b.t#*m for the "dream team"

When you reach the flashing wall in the first level, shoot it five times. Turn around, and you'll see a new hallway has opened up. Down it are five exits that lead to different levels, and a pod that contains nine extra lives.

Once you arrive at the Level 10 exit, turn around 180 degrees and fire at the wall. A new exit will appear and you can warp to Level 20 with this.