Eraser on canvas doesnt work (with iOS)

Hello!
I tried making an eraser for a canvas with background picture and it works perfectly fine when I try it out via an emulator online, but when I try to use my phone (iPhone) as an AI Companion the eraser suddenly doesnt work anymore. Is there any way to fix this?

Thank you in advance!

Well, it won't with blocks like that :slight_smile:

See this scratchcard example from Taifun

https://puravidaapps.com/snippets.php#2scratchcard

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Maybe this is in the wrong category?