I got 18 out of 24, which made me a "master snacker". I was off on the miso soup and sushi, and a couple of the other ones. Some I knew because I've measured exactly how many chips or crackers or M&Ms out for a "serving" so many times.
But it really does go to show how easy it is for portion distortion to overwhelm us.
I only got one wrong, and I'm calling it an error on their part. They showed a photo of edamame in-shell, but used the calories for edamame shelled. Meaning that if you gave the correct answer for the picture they showed, their numbers would only be accurate if you ate the pods. Which aren't edible. Since they didn't specify "Edible Parts", and the picture showed both edible and inedible portions, I object!
Maybe I'm just irritated that this quibble ruined my perfect score!
18 and I underguessed on several of the ones I missed. I did guess the smaller amount on pretty much all of the processed/fast food type things, that seemed like a gimme!