Dr. Theobold: A Text Adventure Game

I am coding a text-adventure game in PicoLisp:

You are standing at the entrance to a building, reputed to be the home of one Dr. Theobold. The entrance is barred by a steel door. There is a five digit numeric keypad on the door. A rubber mat lines the threshold.

Exits: north

> go north

The project is hosted here:

https://savannah.nongnu.org/projects/dr-theobold

and the project files can be retrieved with the command

git clone git://git.savannah.gnu.org/dr-theobold.git

The number of rooms and puzzles is small at present, but growing rapidly.