Does anyone know if the challenge for iphones will be tested on all sizes or just one in particular like the 11 for instance? Or should we make our apps able to fit whatever size
Testing iPhone sizes
It will be on iPad Pro, or MacOS. If iPadPro, it must work on all sizes of iPadPro.
This is defined in Challenge rules : https://developer.apple.com/wwdc22/swift-student-challenge/
Your Swift Playgrounds app project must be built with and run on Swift Playgrounds 4.0.2 on iPadOS 15.4 or Xcode 13.3 on macOS 12.3. If it runs on iPadOS, it must be optimized to display properly on all models of iPad Pro. You may incorporate the use of Apple Pencil.
You should read the document carefully before submitting, to make sure you meet all the requirements.
I have the same question
I email Swift Student Challenge and they said to add a README file that says the instructions on how to run your app including which simulator you prefer. Hope that helps!