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Secret area
When in level 3-2, shoot the second giant asteroid on the right side of the screen until it explodes. Chase the egg that flies out of it, and fly into the claws of the bird that will hatch from it. You will warp to the Out Of This Dimension area, where you will contend with lots of paper products! If you succeed in surviving to reach the giant slot machine, shoot the arm of it until you hit the triple lucky 7 jackpot and you will be rewarded with the "Secret Ending."

Twin blasters
If you fly through ALL of the archways in stage 1 of any of the 3 levels, the Twin Blaster power-up will appear in the largest archway. In level 1-2, before you reach the grey Supply Rings, look for three gold asteroids in a triangle formation. Fire through the center of the triangle and Twin Blasters will appear on the other side (or photon Twin Blasters, if you already have Twin Blasters).

Black hole warp
In level 1-2, 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 2-4, the second to level 3-4, and the third to level 1-4.

The whale
The whale will appear on the Amoeba stage of level 2, the one ending with the spinning, long-armed boss (the stage right before Venom), but only if you do not shoot any Blue Sting Rays. It appears just before you reach the boss, and drops enough power-ups to give you full energy, a shield, double twin blasters, and 5 nova bombs.