I'll Be the King of String Finger World

Nobita's only real talent, Cat's Cradle, is underappreciated, so he uses Doraemon's What If Box to visit an alternate universe where everyone is obsessed with Cat's Cradle and Nobita's talents make him an instant star. As it turns out, however, Cat's Cradle has strange effects on Doraemon, making his cat-type instincts come out (since he is a cat-type robot). Leaving Doraemon to run away and restore everything into normal.