A rudimentary analog type of Pong, assembled from a PCB that came with an electronics magazine and parts from the local equivalent of RadioShack. The controllers were potentiometers mounted on plastic salt shakers, the display was a crt b&w tv.
I was 11, it was my first contact with electronics, coached by one of my mother’s former student who was visiting - he was from Japan, my mother was a highschool teacher and taught him Portuguese (I’m Brazilian) after classes, for which he was grateful.
That kickstarted my interest in electronics and tech, which defined my whole career. Thanks Kenji, wherever you are!