Feynman botched the Mensa IQ test. My hypothesis is either he did it as prank or he just thought about another million possibilities for each item that others couldn't even imagine.
Mensa? Feynman reportedly said that his high school IQ was 125 during his "Address to Far Rockaway High School" (1). I can find nothing about him taking Mensa tests.
Either way, integrating many different paths from multiple directions to reach a solution (hah!) is something intelligent people are more likely going to do which takes a lot of time and requires building abstractions.
1: https://collections.archives.caltech.edu/repositories/2/acce... Can someone verify that?