was powered by a 4-bit CPU from Sharp's SM5xx family, paired with 1,792 bytes of ROM, 65 bytes of RAM across four banks for data storage, and an LCD screen driver circuit.

The Game & Watch name reflected its dual functionality: it combined a single game with a digital clock. The first game, Ball, had modest initial sales but enough success for Yamauchi to greenlight three more games: Flagman, Vermin, and Fire. This eventually led to dozens of titles