In Scratch 3 you need to click the arrow button to make the program larger before it runs properly. 1. Shift-click the flag to enter Turbo Mode and then click the flag to run the program 2. Move the mouse-pointer over a white area inside the maze and press the spacebar to begin The sprite will find its way out of the maze. Try changing the background to a different maze (you might need to change the program if the maze is a different colour), or adapting the program to see if you can make it faster and/or smoother.