Board Thread:Voting/@comment-5475153-20150207230942/@comment-11643042-20150214042057

I say the shorts are definitely canon because they are referenced in the episodes. I think the books should be considered noncanon except for Dipper and Mabel's Guide to Mystery and Nonstop Fun!, and as for the games, I consider only the secrets in them to be canon. (Case in point: Bill Cipher's existence was foreshadowed several episodes in advance through the game Rumble's Revenge.)