The idea is to create a memory palace, where each of the 3x3 boxes is a room, by placing an object on each cell. Additionally you want to give each digit an eccentric character. Once you did this, you can memorize a Sudoku by creating a story that involves the characters (digits) interacting with the objects (respective cells). For the visualization, you want to memorize and visualize which of the cells of each box / room are occupied by a digit, by painting each cell which is occupied by a digit black and leaving all others white. With that visualization you can then scan for boxes, rows or columns which are close to completion. The memory palace is used for storing and retrieving digits and also it gives you an idea of how often a digit has been used in the Sudoku. I don't think you can solve hard puzzles this way. But very easy Sudokus are certainly possible.
Would be great if some of you try it out and let me know how it went
