It’s a fun game, a cross between the old board game Mastermind and Hangman. You have to guess a word in 6 tries, you get feedback on which letters are correct and whether they are in the right position. Every day you get a new set of words to guess.
It’s trivially easy if you have a dictionary file and grep (with tool assistance I can guess every word in 4 tries or less, so far), but quite fiendish without it…