Category:Unsolved Problems

In 2021 Randall made a comic, 2529: Unsolved Math Problems, about three categories of unsolved match problems. The last category was for "cursed problems", a recurrent theme on xkcd. In 2024, almost four years later, a sequel was published, 2943: Unsolved Chemistry Problems. Although it didn't follow the same three-panel setup, the title was similar and the three different problems mentioned were similar as well. A year later, 3115: Unsolved Physics Problems was released with the same setup of the first comic.