lEVEL dESIGN

Each level represents part of the respiratory system of the human body. There are totally 3 levels. The difficulty of each level increases.

First level

The first level represents the body's upper respiratory tract, namely the nose, pharynx, trachea and bronchus. On the road, the player will encounter the following organs:

First, the fan represents the breathing of the human body. When the human body breathing will bring out the vast majority of bacteria, dust and viruses, all theplayer has to do is to judge the frequency of breathing according to the sound ofthe fan, and then try to use the cover to prevent themselves from being blown away.

Second,shard.Shard represents the mucus in the throat, which is also a part of the human defense means, when the player touches the shard will reduce health.

Third, whips, these whips represent the flagella on the windpipe, and when people cough, these flagella push foreign objects out of the body. A player who is hit by a whip not only loses health, but is also pushed away.

Fourth, movable obstacles. These represent the peristalsis of the throat. Theseobstacles rise and fall with events. This defense mechanism is designed to work with fans, and players need to timing their movable obstacle to protect against the wind.

Second level

The second level takes the player to the lower respiratory tract of the human body. Here players will encounter one of the body's strongest defense mechanisms: white blood cells. These white blood cells patrol a certain route. If the player is exposed to them, they will be chased. In addition, their damage is deadly to the player.

But the player will also unlock a new ability: duplication. Players can press E to create a clone of themselves. The player can manipulate this duplicated body to attract the attention of white blood cells and create opportunities for the body to overcome the level.

Third level

The third level is the sum of the first two levels and contains all the enemies and defense mechanisms that appeared in the first two levels.

The channel at the bottom represents the channel to the alveoli, and entering this channel means that the virus has invaded the body, which in another word, game finished.