I spent half an hour playing with these now at https://arcprize.org/play and it's fun, but I must say that they are not "easy". So far I eventually solved all of the ones I've gone through, but several took me significantly more than the 2 tries allotted.
I wonder if this can be shown to be a valid IQ test, and if so, what IQ would a person need to solve e.g. 90% of them in 1 or 2 tries.
replies(2):