Flubaroo Add-on for Google Sheets is a powerful tool for quickly grading multiple choice and short answer quizzes created with Google Forms. Flubaroo has been around for years and almost every week people ask me questions about how to use it. One of the things that I'm frequently asked about is the possibility to accept more than one response to an open-ended response question. You can accept multiple correct responses. In the video embedded below I demonstrate how to accept multiple correct responses and have them graded for you with the Flubaroo Add-on for Google Sheets.
Read this article for an explanation of how using Flubaroo is different from using the quizzes feature in Google Forms.