Big Ben (Add-a-Ball)

Big Ben (Add-a-Ball) is a single-player electro-mechanical (EM) pinball machine manufactured by Segasa, trading as Sonic, in October 1975. As an Add-a-Ball game, it rewards skilled play with extra balls rather than free replays, a scoring style commonly used to satisfy regulations that restricted replay-based machines.

The game keeps score on mechanical reels and is equipped with a pair of flippers. It is documented through the Pinside community database and has not yet been catalogued on the Internet Pinball Database, so surviving design details are limited.