One "bug" in the program's design became a strategic advantage to players in the know, later touted by producers as a "hidden feature". On the right side of the screen there are two platforms situated so that one is above and slightly overhangs another. If a player moves across the lower of the two platforms, the player will hit the upper one and be halted. However, if a player flies their bird so that its belly skims the lower platform low enough that its legs do not extend, the bird will "belly flop" across the width of the platform, and, illogically, "squeeze" through the meeting point of the two platforms, shooting out below the upper platform.
Skilled players took advantage of this flaw as a gaming strategy: a player could suddenly pop out below the platform and land on an enemy knight below (or a competing player), catching him by surprise. Game creator John Newcomer stated in interviews that this flaw in the game's design was so popular, they decided to intentionally leave it in and it became a permanent part of the game.
Joust was one of the "Fabulous Eleven" launch games for the Atari 7800.