astro barrier

First head on over to the Night Club and go upstairs to choose Astro Barrier, then:

1. On the hit enter screen in between levels 10 and 11 wait 30 seconds and shoot the blue ship that appears on the left for secret levels
2. After you start, on the instruction page hit 1, 2 or 3 to start level 10, 20 or 30

The idea is you click the game to start, before you hit the enter key press 1 on your keyboard and it will start you on level 10. Complete level 10 and then the next screen gives you instructions… this is the in between 10 and 11. Wait 30 seconds there and a blue ship appears. Shoot the blue ship and watch the secret levels appear. These are a bit challenging  so have fun!