Telehack is a simulation of a stylized arpanet/usenet, circa 1985-1990.
It is a full multi-user simulation, including 25,000 hosts and BBS's
from the early net, thousands of files from the era, a collection of
adventure and IF games, a working BASIC interpreter with a library of
programs to run, simulated historical users, and more.
You can telnet directly to Telehack on the regular telnet port of 23.
Open a command shell and type
See http://telehack.com/telehack.html for more information.