A - Secret message: the designer of "Xevious" has included a trick for generating his name right at the beginning of the game.


B - As soon as Solvalou appears, move to the far right edge of the screen and begin bombing constantly. 
    Continue bombing until the first set of Toroids is very close to you and then shoot the rings.
 

C - The message 'Special thanks for you by game designer Evezoo.' will appear on the screen.