Bulb Boy is a point and click horror adventure. You are a boy with a glass head. The game starts with you waking up in the middle of the night in your house. It seems like a regular night, except that your head is covered with a white light. You are not in a good mood, so you take a quick look at your room. You see a strange thing. A dark shadow is creeping along the wall. When you try to get rid of it, you hear a noise.

The gameplay is divided into several chapters. In each chapter, you need to solve a puzzle and defeat a monster. You will get new items and weapons to help you.