The Machine: Bride of Pin-Bot is a 1991 pinball game released by Williams. It is the second game in the Pin-Bot series, and is the last game produced by Williams to use a segmented score display rather than a dot-matrix screen. It is also one of the few pinball games produced that uses a variable-brightness segmented displays.

The primary plot of The Machine revolves around the eponymous female robot (also known as The Machine) that makes up the majority of the playfield. The robot begins the game in a semi-completed state, requiring the player to activate her voice circuits and her eyes, then cause her to metamorphose into a human female. Each of these events occurs as the player makes shots up the left ramp to lock balls. A two-ball multi-ball mode begins once the player locks two balls as her "eyes", enabling her to "see". During multi-ball, locking the two balls again begins her metamorphosis into a fully human woman. The Machine reverts to an incomplete robot when multi-ball ends.

The left ramp feeds into two areas: A pachinko-style raised playfield similar to the one in Pin-Bot, which can drop the ball either back onto the main playfield or into the shooter lane; and an enclosed area containing a rotating box with The Machine's various facial states on each side. The box contains raised guides and holes depending on which face is showing. Beside the left ramp is a saucer containing the Small Wheel. In single-ball mode, shooting this saucer awards a random Small Wheel award, which includes lighting a timed jackpot. During multi-ball and after the Metamorphosis, the player must lock both balls to spin the Big Wheel, which awards larger random prizes including lighting the centre ramp (called the "Heartbeat Ramp") on a timed interval for a shot worth one billion points. (Scoring this shot at least once causes the player's score to be recorded in a special "Billionaire Club" high score list, separate from the main high score table.)

Once her voice circuits are activated, The Machine provides spoken feedback to the player on their shots. The Machine's voice is provided by Chicago-based singer Stephanie Rogers. Due to the sexual overtones in some of her speech, the game includes a "modesty" setting that prevents some clips from being played. The original synthetic voice of Pin-Bot is also featured in the game.