With the programming language Sinclair BASIC, you have an awesome command called 'DIM'. With that command you can create matrix fields (or sth..). Because I needed them, I made 3 Blocks that are similar to the function of the original command. To try the Blocks, just go in 'Look in'-Mode then go to the 'Stage'-Sprite, the rest is self explaining. Have fun!
To download the Blocks, just right-click on the 'Block'-Sprite and click on 'Download Sprite'.