Bestselling classic book series and top-rated TV Show! More than 5 million Arthur Adventures sold! Celebrate Arthur's birthday with all of his friends in this funny story about two birthday parties scheduled for the same day. Arthur can't wait to hand out his birthday party invitations. But it turns out Muffy is having her party on the exact same day! All of their friends are struggling to choose which party they should go to. Pretty soon, friendships are on the line! To save the day, Arthur and Francine hatch a clever scheme to make sure Arthur and Muffy have the best birthdays yet.