As hard as I try it is impossible for me to try every Kit Kat flavor available in the world, but luckily there are some other amazing bloggers who pick up the slack. Here are two reviews of two Kit Kats I won't be able to try anytime soon due to lack of availability.
Kit Kat Mild Bitter from Japanese Snack Reviews is a special edition Kit Kat that is so special it's only sold in one store in Japan. Too bad too because I would love a dark chocolate Kit Kat.
Peanut Butter Kit Kat Chunky from Snack Love is a British Kit Kat so that makes it hard to get here in Japan.
Check them out!