Nowadays, there are many popular inner-space animation available on Youtube. However, this kind of games are seldom on the market since most of the game focuses on outer-space rather. We can adopt the idea of the online 3d video for guidance of the game level desgin part. For example, this youtube visually displays what happens inside the circulatory system and by imagination there seems to be several gates used for holding the oxygen particles so that they can be brought to other parts of the body. We can also achieve something similar. Maybe eventually our game project will end up like many sub tasks combining together to be a root. We are still researching to get the idea concrete.