Arrow keys to move. Navigate to the apple at the end of the maze.
UPDATE: I've made a Maze Maker project that lets you create your own mazes. http://scratch.mit.edu/projects/25162668
You can import these mazes you find on the web as screenshots. Look here for instructions on how to do this: http://scratch.mit.edu/projects/25163264/
See how this program is made at http://inventwithscratch.com/maze-game/
Learn to program games with this free online Scratch course: https://inventwithscratch.com/class