what is blue box in CFAI cirriculum

people here are talking about bluebox. What’s that?

I looked at my level 2 and newly received level 3, I don’t see any color other than black and grey.

the solved examples in CFAI texts. they used to be in blue colour…

Yeap, they are now refered to a black boxes i guess? Basically any questions in the reading that has a giant box around all of it and solved for your viewing pleasure.