From Mario Fan Games Galaxy Wiki

Doodles was a subforum of the Arts Board that opened with the first iteration of the phpBB forums. Doodles was intended for members to showcase relatively "non-serious" artwork, while the main Arts Board was for things like sprite sheets and topics that previously would have gone in General Friendliness. However, the difference between the Arts Board and Doodles was nominal, as the Doodles board quite often included some fairly impressive work. This board was scrapped after The Split and has been largely forgotten.