Entering N-Tropy's First Level (by hand no less)

Entering N-Tropy's First Level (by hand no less) is a Single Player level in Quake. This level was the second made by N-Tropy, the name was a placeholder that was carried over from the older name for N-Tropy's First Level.

This level was a work in progress and intended to be the next level made by N-Tropy. It is unknown if it was ever completed; the version released consisted of little more than geometry, some lighting and Water, and a single Rottweiler.

In addition to the Rottweiler are two other entities, neither of which exists in the vanilla game. These are custom entities made by N-Tropy, likely used as a testing environment. The Weapon, "weapon_laser", is a LaserGun. This level is one of the earliest examples of a map with custom entities.

The second custom entity is known as monster_att_dog. It is unknown what this entity is or if it was ever released to the public. The name suggests a custom Monster that was similar to the Rottweiler. Note that the earliest known custom Monster, the Psionic Slug, was released 2 months after this level.

Walkthrough
Turn left. Kill the Rottweiler to your left, then jump over the pool of Water straight ahead. Collect the LaserGun on the opposite side.