Purchased in Japan. Not sure if these actually have caffeine in them. There is some red Japanese text on the back which I'm hoping isn't a warning about how many to eat at once.
The Tough gummies do indeed have an extra stiff bite which I quite enjoy. Cola flavor is good with a bit of sour (similar to sour sugar coated cola gummies). Energy drink flavor tastes like Red Bull or Rockstar, or chewable children's vitamins. I believe the dominant flavor in both comes from B vitamins. Quite enjoyable. 85/100