In this chapter, we will look at the process of debugging. As with any engine or programming language, it's easy to end up with bugs in your code or things that just plain don't work. This happens to all game developers no matter their skill, so it's important to be able to debug these errors or problems and solve them as fast as possible. In this chapter, we will look at a few techniques on debugging of games and also how to read common errors in GameMaker.