Just move the beetle with the arrow keys to eat the apple. not very exciting but it is just a demo for someone on the forum. I also hope to create a tutorial on the methods but it was quicker to actually do the coding so I've done that first. Tutorial now up at http://scratch.mit.edu/projects/47150778/
This is just meant to show how easy the grid method can be. The sprite can only move into blank cells or cells containing food but none of that involves colour detection - any of the obstacle costumes in the sprite that stamps the playing area will be detected and the area could contain a range of costumes without any additional work to detect collisions.
