Advance Lawnmover Simulator

Advanced Lawnmower Simulator is a video game for the ZX Spectrum. The game was "reviewed" in Your Sinclair in april 1988, and in that same magazine was a fake add telling the game was published april 1st. It all was an April Fools' Day joke. But the magazine did publish the game on their cover cassette in september 1989. The magazine claimed the game was developed and published by "Gardensoft", by the game was made by the magazines own Duncan MacDonald. It was not officially labeled as a prank until August 1990. The player is tasked with mowing yards with a lawn mower in exchange for rewards.

Source: Wikipedia, "[en.wikipedia.org/wiki/Advanced_Lawnmower_Simulator Advanced Lawnmower Simulator]", available under the CC-BY-SA License.