Atari 2600 - A2600
As the name suggests the blinds demo is not a game, but a demo that simulates a pair of blinds! The joystick can be used to raise and lower the roller shutter by pushing it up or down. When the curtains go up the beautifully done sunset is visible from the window.
The history of blinds demo is quite interesting. As most people know, Activision was founded by several former Atari employees who left due to Atari's policy of recognizing programmers (or lack thereof). One of these collaborators was Bob Whitehead, the creator of the "shutter" technique, which was first used in the Atari video chess to display eight objects in a row instead of the usual six. While Activision has never used the Venetian blind technique in any of their games, this hasn't stopped Atari from threatening to sue Activision for "stealing" the technique along with various other proprietary information.
Since Activision knew they didn't steal anything from Atari, they decided to play on Atari. According to David Crane, when Atari's lawyers questioned them about the "stolen" Venetian blind technician, David showed them this demo and said "Is that what you mean?". Apparently Atari wasn't in a humorous mood, and they went through with a lawsuit. In the end, Atari lost the case and Activision became the most successful of the 2,600 third-party companies.
Although Activision never made a game from this demo it's not exactly a waste. The sunset was later used in the background of the copter.