I would like to see what it would cost to make a personal ipad app that will allow me to draw a 4 x 4 grid (magic square) that will be projected onto a screen as I draw and write numbers on each square with an "overlay" that will not be visible to the viewers (only visible to me on the ipad).
I would like the overlay to be visible on the ipad when I want, and invisible when I want (by touching an area of the screen).
I may require 99 different overlays (all the same pattern but containing different numbers) selected by touching the number on the master overlay.
What the viewers will see is me drawing a grid and writing numbers on the grid with a stylus -- nothing more.
What I will see on the ipad is what I write plus the master overlay where I can select one of the 99 overlays as I write with the ability to turn the overlay on and off when I want (so I can show the ipad to people without them seeing the overlay).
Let me know if this is possible. I have a layout in mind for what the overlay will look like.