Uploaded May 2020 | Updated September 2026, 2 weeks ago

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• BUG: Cavity - The captive balls are brown and flicker, which allows them to sometimes pass through a brick and even your paddle (videos #1 and #2). According to programmer Erik Mooney, “The ball isn't really going through the paddle or brick, but rather *around* them. Notice that each time it happens is synchronized with a collision with the left wall. It's going two frames deep into the side wall before detecting the wall collision. By the time it's back out of the side wall another two frames later, the vertical position of the ball has finished passing the paddle/brick. It takes *four* frames for that to happen (the paddle is four lines tall) which is why it doesn't happen out in the open; i only happens if the ball spends two frames digging into the side wall and two more frames coming back out, so it never trips a collision with the paddle/brick.”

See the Easter egg section of Atari Compendium for more information:
ataricompendium.com/game_library/easter_eggs/easter_eggs.html