So I saw Raiden III as a PS2 Classic up on the store before, but today when I went to buy it I couldn't find it. I search and all I can find is Raiden IV: Overkill.
I know it should be there because this page exists. I've been searching all over the internet, but I can't see anything anywhere about it being removed from sale. But was it removed at some point? And if so, why?
I'm curious, how did you find that link? It didn't show up for me in a search or browsing, so it has probably been removed from the store, but since there is a link to it still it may be an error. You might try contacting the developer to confirm that.
I found it via a Google search. I remembered seeing Raiden III in the PS2 Classics while browsing (on my PS3) once, but couldn't find it now when I went to buy it. Ran a search on Google and found that page.