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I think he's requesting it on the system level. For example, if iOS allowed you to force PIN+TID when opening a specific (not necessarily secure) app for the first time after an unlock. Intended for apps that don't necessarily have security built in already.

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This is especially useful for when the app developer doesn't think there is a reason for them to develop such a system. For example, I don't want my son playing a zombie game, but I myself play it often. I could then lock him out of said game, but still give him my phone to use.

This isn't exactly what you are looking for, but have you tried Guided Access on iOS (or whatever the equivalent is on Android)?

Yes, that is the way I do it currently. It's a real pain though.

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