You are an adventurer-cum-philosopher, carrying a treasure map, and wearing a blue overcoat that your companion, Leo, a Lemming, is sleeping in. You stand in a town square dominated by a large tree and a cannon. Lodged in the upper branches of the tree is a wooden chest labelled "The Treasure of Phlegm".
You have traveled here to solve the greatest mystery of all time: Phlegm.
Written by Jason Dyer in Inform.
IF Comp 1996: 17th place of 27 entries.
XYZZY Awards 1996: Finalist for Best Individual NPC (Leo the Lemming).
Source: IFWiki, "Phlegm," available under the Public Domain License.