Oh no! I am so sorry to hear that. We wanted the process of working with this dataset to create a useful app to be a fun and engaging experience, but the uneven experience that our teachers and students are having with being able to properly populate their arrays is frustrating.
We will definitely be working on addressing the experience for next year’s course, as well as making the original style of Practice level available in addition to the new user story > app creation method.
Thanks for sharing your experience,
Erik