Blast Radius Cheats (PSX)

In BLAST RADIUS, you are the last member of an elite fighter squadron, and you have landed in the middle of the conflict between the evil Kotan-Kai and the docile Vorn. The Vorn want you to defend them; in return, you'll get to fly nine of their most advanced spacecraft. Take out the Kotan-Kai with 13 different weapons including torpedoes, rockets, seeker missiles, and fusion nukes in 40 levels of intense dogfighting action. After successfully defending the Vorn, use a link-cable to destroy your friends in the Two-Player mode.
(description available courtesy of psxa2z.com)

CHEATS

All ships powered up:
Press Right, L1, Up(2), Down, Right, R2, L2, R2, Down, Up, Down at the main menu. The sound of an explosion will confirm correct code entry. Select any ship, begin game play, then quit. All four ships will now be powered-up and Sector 5 will be available for game play.

Wraith ship:
Enable the "All ships powered up" code. Then, press Left, Right, L1, Left, Right, L1, R2, R2, L2, Left, Right, Up at the main menu. The sound of an explosion will confirm correct code entry. Select any ship, begin game play, then quit. The Wraith ship and Sector 8 will be available for game play.

Alternate planets:
Press Down, Up, L1, Right, L1, Up, Right, Select, Right, R2, L1, L2 at the main menu. The sound of an explosion will confirm correct code entry. Faces of the development team will appear in the place of the planets in the first four levels. The next four levels will have other objects replacing the planets. Note: This code may not be enabled with the "All ships powered up" or "Wraith ship" code.

Bonus levels:
Press L1, Left, L2, Down, Select, Left, Down, R2(3), Select, Up at the main menu. The sound of an explosion will confirm correct code entry. Four bonus missions that feature World War II aircraft and other hidden targets will be accessible. Note: This code may not be enabled with the "All ships powered up" or "Wraith ship" code.