The gap at the top gave Pong rallies an exit
In Pong, each paddle follows the player’s up-and-down input, but the circuitry imposed a limit: neither paddle could move all the way to the top of the screen. That left a narrow strip the paddle could not cover. A ball sent through that strip could slip past instead of being returned.
The limitation mattered because a rally ends only when the ball gets beyond a player’s paddle. If every part of the screen remained equally reachable, two players might keep returning shots for a long time. The uncovered strip created a vulnerable route—and a reason to aim carefully rather than simply meet the ball wherever it arrived.
A technical mistake became a design decision
Al Alcorn, who built the game’s circuitry, could have treated the movement limit as something to fix. Instead, he kept it because the gap made rallies more competitive and kept them from dragging on. Players had to watch the ball’s path and position their paddles with the uncovered area in mind; the flaw gave the simple exchange of returns a sharper tactical consequence.
That is the useful design lesson in Pong’s broken paddles: a constraint can shape play when it changes what players can reliably do. Here, an accidental boundary turned the top edge from empty screen space into a target—and gave a rally a way to end.
