Today I launched a new daily game called estimatle. Every day, you guess/estimate 5 different numerical questions (such as "When did the Titanic sink?" or "How many keys are on a standard piano?"). Then, you can compare the results to the other players and the real answer. The idea of the game is to test your general knowledge and guesstimation skills, while also hopefully teaching some facts about the world.
I am interested in any feedback!