DS7, tested as HG, finds them really tricky. He tends to look for something way more complicated than the question intends.
I don't know about those particular puzzles, as he hasn't really tried them, but my DS7 tends to look for something way more complicated than the question intends for a lot of things! This has been his most serious problem with math in general; although he is 3-4 grades advanced in math, he misses things entirely on the simple questions because he is out there answering things in the ozone layer. I guess it goes with the territory!
