The definitive text adventure game. It provided inspiration for dungeon and Zork and all the later text and graphic adventure games; one of the chief early genres of terminal or console games, before such innovations as rogue provided. The earliest versions were CP/M and UNIX based. Sometimes known as Colossal Cave, as that is the name of the cave in which the adventure primarily occurs and which the topology is vaguely inspired by; apparently the author was a spelunker himself.

A few scenes from the text adventure "Adventure": ---
You are standing at the end of a road before a small brick building. Around you is a forest. A small stream flows out of the building and down a gully.
You are inside a building, a well house for a large spring.

There are some keys on the ground here.
There is a shiny brass lamp nearby.
There is food here.
There is a bottle of water here.
You are in a 20-foot depression floored with bare dirt. Set into the dirt is a strong steel grate mounted in concrete. A dry streambed leads into the depression.

The grate is locked.
You are in a maze of twisty little passages, all alike.
You are in a debris room filled with stuff washed in from the surface. A low wide passage with cobbles becomes plugged with mud and debris here, but an awkward canyon leads upward and west. A note on the wall says "Magic word XYZZY".

A three foot black rod with a rusty star on an end lies nearby.