Click to change the value of the square you are hovering over. Scratch doesn't have arrays included, so I made some. There are a ton of custom blocks on the inside of this project, all of them supporting arrays. So... have fun :) Block explanations are inside.
I used some of @ProdigyZeta7 hacked blocks from this: https://scratch.mit.edu/projects/12676518/ project. Ask any questions you have in the comments. Also request blocks in the comments.