I made this out of boredom. Opinions on each: Raw: Can be good if you have an interesting/detailed flag, otherwise PLEASE add more. Rare: Probably the best for any Countryball. Medium-Rare: I usually make my balls this way, mostly because my country flags are usually very basic Medium: Still good, but some people might get mad at a design like this. Medium-Well: This is my cut-off of when I think a CB OC looks good. Well-Done: PLEASE don't do this one.
