Read the review here.
“This is not among the all-time most difficult NES video games ever made, neither is it really among the very worst, but it is both hard and bad. In other words, it bads real hard, a phrase which makes just about as much sense as the premise of Cool World itself.”
– from the full review, which you can read here.
First of all: “Cool World” is a stupid, dipturdy name for anything, whether world, movie, or video game.
Secondly: This game sucks.