Once you complete a story line, you unlock a new weapon. If you complete both light and dark missions an end level, then the weapon you previously unlocked on that level will be upgraded to level 2, which will give it more ammo or more power or something. These are the secret weapons:
Samuri Sword-- 4 ammo and fires a thin beam. Upgrade--?
Egg Vaccuum-- Can suck up 25 things when upgraded. Once full, you get free lives and stuff.
Satellite Gun-- You know the first level where lazers come down from the sky? You can aim it!
Omachao Gun-- If you remember him from sonic 2, you fire mini omachaos at enemies. Heal Cannon-- BORING. All it does is revive dead GUN soldiers.
Shadow Rifle-- It's nearly impossible to get, but it is a super strong lazer cannon and looks totally awesome!!! However, you have to have seen every ending and beaten the "Last Story" in order to get it. Personally, I think It's worth it.
Added by: cugino Dec 1st 2005, ID#5025