Move backwards with your arrows. Although you will always have to get to the key, you can do so backwards one step at a time. It can be easier to plan routes starting from the key to find paths that are easily overlooked. Timing will become very important in later levels. Even if you get a Power Pellet and can eat the Ghosts, or have to squeeze between them, starting your sprint too soon or too late will result in failure. Consider starting Pac Man when the ghosts are in different places to get different outcomes in your run. When Pac Man hits a wall, he will bounce off and begin moving in the opposite direction. Use this to reduce the number of arrows required to change direction and get a better chance of earning a 3-star rank.