Pyramid 2000 is one of 3 machine language text adventure games that Radio Shack originally brought out on the TRS-80 Model I/III series, and then converted to the Coco (the others being Bedlam and Raaka-Tu). This is the hardest one out of the series in my opinion, with some randomly shifting rooms and mazes to deal with, and objects that will react differently depending on other objects that you are carrying or even just in the same room.
In this game, you have to navigate through the pyramid and try and find all of the treasures, and bring them back to the entrance way (you do get points for finding them, but you get more if you bring them back to the entrance). I am still confused as to why all 3 games in the series, which play identically between the original TRS-80 Model I/III versions and the Coco versions, all got completely new artwork for their manuals, unless just to differentiate which platform they are for.
Title: Pyramid 2000
Author: Robert Arnstein (Device Oriented Games)
Publisher: Radio Shack/Tandy
Released: June 1982
Requires: Color Computer 1,2,3, 16K RAM, cassette.