I've completed it and I remember everything!

I've completed it and I remember most things.

I've completed it and I can't remember a thing...

I've played parts of it, but not all of it. I remember quite a lot.

I've played parts of it, but I only remember bits.

I've played parts of it, but I don't remember anything.

I've not played it at all. I've read/heard a lot about it, though.

I've not played it at all. I know bits... Crystal Tower, Onion Knights... not much else.

I've never played it at all. I don't know anything about this game, to be honest!