What's with the anti-aliasing in Gameboy sprites?

[Gors]

But Belmont's Revenge didn't need it -- the sprites would have been better off not blending into the background.

If it wasn't needed, then the graphic designers wouldn't do that.

Since they're 4-color sprites, you need to make them readable. This is when anti-alias comes in handy: with a lighter outline, you can see the sprites in any background.

Also why'd you recolor sprites?