We called this the Rainbow Dice puzzle. My daughter worked it with me- so the sessions went quick, but they weren’t many (and far between). She got bored so quick at each sitting. I found out we have different methods for doing puzzles! She insisted on sorting all the colors before we started-
the border pieces were all white
and then she liked to take a piece, scrutinize the picture guide, and figure out exactly where it went in the puzzle, put it there. I prefer to pick up a piece, look for what else matches it, bother later about figuring out where it goes. And she likes to have pieces of choice to work on for the moment in the empty space still available inside the half-done puzzle, while I prefer to keep them all on the outside until they go with something. We kept crossing hands in the middle, with a tad bit of frustration at each other, but it was fun regardless!
It was done in just four sittings. First one we sorted colors and started on the border. Second sitting we finished the edge and I did the blues. Third sitting was all the pinks, purples and red. Fourth was all the rest, with breaks to pause for a few photos.
I didn’t realize until we finished it, that all these pieces are the same shape- two knobs, two holes. But there is variation within that basic shape, and we were always looking at the colors, style of the dots or design on the dice anyway, so it was easy enough to do. Amused ourselves wondering why some dice have animals or symbols on them (some specific game?) finding the clear ones with other mini dice inside them (so cool, my daughter has a yellow one, just like the one at center) and the ones with blank sides (not sure what those are for, either).