Nintendoâs Game & Watch can run Doom, barely
See the original posting on The Verge

Intrepid developers have done the expected and necessary: Doom now runs on Nintendoâs recently released Game & Watch portable. The Game & Watch: Super Mario Bros. was designed to run three games, but successfully porting Doom shows it can handle others if you have a lot of patience (via Hackaday).
This version of Doom is not perfect, of course. In order to get the game to run even at the slower speed shown in the video below, sound had to be disabled and textures had to be simplified to fit the game on the small portable. And getting that far wasnât easy: programmers stacksmashing and Konrad Beckmann had to trick the Game & Watch to offload its firmware by injecting code into the external storage accessed by the Game & Watchâs tiny…