I was not on the previous forum (Greg's ?) so my curiosity is peaked. Is the intended answer the 5 Wacky Packages shown on the 1967 Die-Cut release box?
hopefully piqued as well.
you got it, the 5 titles on the box
there was a good range fun brain teasers, set out as math, band, recess, history(?), etc.
I recall one was something like "What is the next number in this sequence: 15, 19, 21, ?"