Type-in listings in computer magazines in the ’80s were more than just an opportunity to get some “free” software, with the only expense being the cost of the magazine and your time. They were also a chance to learn something.
In many cases, type-in listings were accompanied by commentary from the author explaining the processes and techniques they’d used in order to create the various functions within the program. In the case of Ants in Your Pants by Allan Knopp, published in issue 27 of Page 6, the technique in question was “page flipping” — a method of getting the computer to draw several screens in advance, then seamlessly switching between them to create the illusion of full-screen animation.
As a game, it’s fairly limited, but as a demonstration of some of the things it’s possible to do in Atari BASIC, it’s definitely worth a look!