Black hole warning
When small, white objects begin swirling around the eye of the black hole and become larger and in greater numbers, leave.
Cheat mode
During the game press start, then hold L and press C-Left, C-Left, C-Right, C-Right, B, A, C-Up, C-Up, C-Down, C-Down, Start.
Original Asteroids, credits, and relentless mode
When you are at the main menu, hold L and press C-Left, C-Right, C-Up, C-Down, A, C-Up, C-Down, C-Left, C-Right, Start.
Solar flare attack
In Zone 3, Sun, stay away from the top left corner of the screen as much as possible. That is where the deadly solar flares always attack from.
Black hole warning...