One puzzle a day: five trivia questions, each in a different language, the same challenge for everyone. It is less about knowing the words than reading them: you learn languages by pattern-matching and intuition. Free, ad-free, no sign-up.
Every day is a themed set tied together with an on-this-day fact, so each puzzle is a small slice of culture as much as language.
Languages in rotation: Spanish, French, German, Italian, Japanese, Portuguese, Dutch, Swedish and Turkish.