Try deleting blocks one by one until the tip moves forward. If that fails try deleting all the blocks. If that fails, click on the orange arrow in the top left to exit, and restart the challenge.
Make sure you hit the NEXT button when it’s present.
Still having trouble? We've got you covered. Download this file and you'll have access to the completed code for every challenge within the app for your Harry Potter Kano Coding Kit (don't worry, we won't tell if you don't 😉).
Once you've downloaded the .zip file, you'll just need to unzip it to find the .kcode files for each individual challenge.
To import these .kcode files, head into the challenge, click the gear ⚙ icon, then 'Import'. Find the file for the challenge you're stuck on and import the file into the app. You should then be able to continue on your adventure!