I love Magic Squares but always thought of them as being a demonstration of mathematical skills rather than magic. Not that there's anything wrong with a demonstration of skill, I like having a variety of items in my show. But in this case, my goal was to make the Magic Square trick seem magical rather than mathematical.
This is Instasquare. You show a blank grid, drawn on your pocket notepad, and ask someone to call out a number. A wave of a pen and the grid visibly fills with random numbers. You then tear off the sheet, sign and date it, and give it to the stunned spectator, showing them sixteen different ways the Magic Square adds up to their chosen number. A memorable magic souvenir.
I am not a professional and have only recently returned to magic. This is one of the first tricks that I have purchased and the most expensive so far. The quality of the gimmick is OK, not great (the lines are not aligned as well as I think they should be). The page shown to the spectator first is a less bright white than the page given to the specatator. It was very noticable to me, but might now be in a less well lit room. I showed this trick to one person so far and they were fooled!