It combines the 5-letter word guessing of Wordle with the number-puzzling of Sudoku. It’s a simple but elegant hybridization of the games, with a new word to solve every day. The rules are simple.

Reddit engineer Josh Wardle created a word-guessing game for his puzzle-loving partner in 2021. Within a few months, the online game — known as Wordle — had taken the internet by storm. So ...