When you do a puzzle, you may not realize it ... while trying to determine where it fits, your brain is hard at work.

By Dylan Freedman and Cade Metz Produced by Juliana Castro Varón and Umi Syam In 2019, an A.I. researcher, François Chollet, designed a puzzle game that was meant to be easy for humans but hard ...

As described by puzzle editor ... have to do with ice: ice, icicle, iceberg and frozen pond. The answer hangs on the various qualities that attach to the word bone: it is hard, difficult to ...