The children should already have a good sense of how to move a sprite around the screen from the session on turtle graphics. Note that turtle graphics move the sprite relative to its current position and is a much simpler system to introduce to children than placing an object on a grid with X and Y co-ordinates. Scratch supports both approaches but we recommend that younger children stick to the relative movements and repeat turns of 30 degrees rather than learn the coordinates on a grid and angles.
