The nasal mucus appear as a green slime like character, appearing as a small green blob with an eye.
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In Flue the nasal mucus travels through fifteen square tunnels to reach the hole at the end of each level. The nasal mucus can move onto walls and ceilings. The nasal mucus avoids hazards such as spikes and fire blasts.
At the end of the game it is revealed that the nasal mucus had been out of a man's nose the whole time, and the tunnels were most likely the person's nasal canals.