There were six puzzles in the series, per the entry below from the 1979 Milton Bradley catalog*. I’ve got a close-up of another puzzle here.
The brilliant art on the one above is from Ken Kelly for Eerie #64. Kelly’s cover work is featured on four of the six puzzles.
*The blurb reads
This spine-chilling puzzle assortment has long been wanted by all our fans of the macabre and grotesque. From Warren Publications “Eerie” and “Creepy” comic series, we present in puzzle form, six cover illustrations that are considered to be classics by comic book collectors…
“Considered to be classics by comic collectors” is a backhanded compliment, isn’t it?
(Images via eBay)
2 Warps to Neptune 
Those are pretty cool. I love the artwork.
So happy to finally find these images of the EERIE jigsaw puzzles I had as a kid.