Bornville Town I’m Missing 17tiles In This Game Can’t Find Them Anywhere

The only 2 things you can do is search "Diggy's Adventure Borneville" on YouTube & watch the walkthrough of the level to see if you missed a hidden area, which it likely is due to how many you need, or wander around the level to see if any walls highlight with numbers or holes in the ground etc.

I hope this helps as I know how frustrating it can be.