Cheap knock off. It routinely won't accept normal English words as valid. Perhaps its dictionary data is a bit off. Today it wouldn't accept "bought" as a word in it's 6 letter "expert" puzzle. Also, there is zero thought put into choosing the words of the day. It just seems to be random. Today's "easy" 4 letter puzzle ended in "est." Even if you knew that after your first word, you'd have 10 additional possible words to try over 5 guesses. Deleted the app.