In level 12 before you reach the grey Supply Rings you will see three asteroid bars each made up of 4 gray asteroids with a gold one in the center Destroy the first 3 bars by waiting until you are as close as possible then blasting the gold center asteroid If you are close enough when you destroy them a grey laughing asteroid appears Blast it and enter the Black Hole it reveals Three exits which look like grey Supply Rings are within The first goes to level 24 the second to level 34 and the third to level 14