So I recently picked up the King in yellow expansion and played a solo game with it. Some thoughts.
I initially decided to play with the Herald with hastur as the AO, but then thought maybe that would be too cliched, so I decided to pick an Old One at random. I picked...Hastur. I guess the game was trying to tell me something. Investigators were Gloria, Carolyn, Jenny, and Sister Mary.
I really like most of the new items. Nothing seems too overpowered, or too weird, while still being unique. The Cursed Sphere became a power player for me during the game; giving that to Carolyn proved extremely effective. Sadly I didn't get to try any of the new spells do to a poor shuffle, but they looked interesting and maybe a good move from some of the more dissapointing spells in the base game.
When it comes to the Yellow Sign tokens, I'm not sure if there is a good reason to put them on the Terror Track. I had to put down two at one point, and I decided I would split them since it seemed a shame to not actually use any of the Blight cards. I wound up with Doyle Jeffries starting riots across town which pinned in all my investigators and could have resulted in even more terror had I not been lucky rolling. This leaves me to wonder if it's ever really a good idea to add Yellow Signs to the Terror Track instead of to Doom.
I had Act One come up, but that's as far as the play got, fortunately. Apparently there had been too many delays.
I eventually won by close. Overall it seems like a good set, although all be interested in seeing ALL of it.