Friday I was playing around by using keyboard entry to control my prototype. I put together a quick demo of navigating a grid using keyboard arrow keys. The logic uses a two-dimensional array to identify the index of a layer for both the x and y axis upon key press. Take a peek at the code to get a better understanding. This may be useful for you in the future. Cheers!
Shout-out to Hayden Schoen for assisting me and showing me how powerful two-dimensional arrays can be.