My bad -
When I wrote about the 'Bonus' Disc that came w/ the PS2 version of Baldur's Gate: Dark Alliance 2 before...the disc actually says:
"Non-Interactive" and I had written it as "Interactive".
At any rate, curiosity got the best of me & I popped the disc in just to see exactly what it was...and I was pleasantly surprised!
It had the 4 headings:
"History",
"Character",
"Hints and Tips", and
"Gallery".
It had a ton of back-story, developers talking and Q & A, slideshows, trivia, and "making-of" features on it.
I'm still surprised that I'm just now learning of its existence!
I'm thinking that it either had to be given out, promotionally, at an event -or- ordered/sent-away for because:
A). None of the DA: 2 cases are "double-disc" cases, and
B). There's no mention on the box/packaging about it, either.
...just weird...