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Can you hide any app with a dialpad code?

I've had apps I've used before that made themselves invisible unless a chosen or preset dialcode was typed into the phone app. Can you do that with any app, and if so, how?
 
Are you thinking about secure folder?

I'm thinking something more sophisticated than that, I think. Basically, if I wanted to put an app that notifies me if any of my files are deleted but I don't want anyone who uses my phone to be able to delete it or see it, how to hide it from even system files. I'm not sure it's possible.
 
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