Jeopardy
If you don't know the Jeopardy game, go look it up at Wikipedia: Jeopardy!
Display and game logic
To display the game, count points and all the cumbersome stuff Christian Lange's @chlange/jeopardy was used.
Hardware
Breadboard
This is how the whole circuit looks like on a breadboard:
Controller
The four controllers were made of wood (actually parts of a broomstick) and a pushbutton with a LED:
Code
Just download it from here (.zip or .tar.gz) or go to the github page.