Can't remember what they are called...someone help

What are those knit/crochet projects called when you only get some of the instructions at a time? Does anyone know what I am talking about, lol! And where can I find one if you do. TIA!!

Can't remember what they are called...someone help

mystery knit along

if you're on ravelry.com, they have them all the time. some are paid for and a lot are free. i'm too chicken to play along if i don't know what the final project will look like lol.

i signed up for a downton abbey one, last year. i didn't even cast one once i found out it was gauntlets lol