Sound does not work on iPad but does on iPhone – Montessori Crosswords for Kids Review

Neat app if you have sound. However, iPad sound has never worked for me but iPhone does have sound and it's great - so conflicted about rating it. It's 4 stars if its fully functioning. How hard could it be to fix? A bit shocking that so many reviews say this yet still not fixed.
Review by Emkur on Montessori Crosswords for Kids.