Graphing calculator
YouTuber "LGR" showed fans back in 2017 how to install the 1993 first-person shooter game onto a Texas Instruments TI-83 Plus graphing calculator. Just don't let the teacher spot you.
Apple Watch
Facebook's Lior Tubi and four others hacked together this port of Doom for the Apple Watch back in 2015, at a time when the smartwatch was still fresh onto the market. It uses a three-by-three grid of invisible buttons, with the lower set used for walking and the upper set used for opening doors and shooting.
Treadmill
After realizing that the gym's treadmill was just a standard Intel Core Solo PC with a custom version of Linux, Reddit user "Kreeator3" claims that he managed to get Doom running by "power cycl[ing] the treadmill a few times." Unfortunately, the enterprising Doom fan says they got kicked out of the gym before they could push it to the limit.
Playdate
The Playdate is an upcoming handheld video game machine from Mac developers, Panic. The firm has recently started publishing games like Untitled Goose Game and Firewatch. The new device has a black and white screen, a rolling cycle of innovative games set for launch, and an analog crank.
Oh, and naturally it runs Doom.
MacBook Pro Touch Bar
The Touch Bar that runs along the top of recent MacBook Pros can hold a variety of useful shortcut keys, but can it run Doom? YouTube user "diffractive" found that, indeed, the game runs on the 2,170 by 60 pixels OLED screen. If you can play it on a Touch Bar, you can play on anything.
Car consoles
Reddit user, "Starks" claims to have loaded Doom into the head unit of a 2018 Honda CR-V EX AWD, which runs a version of the Android operating system. The end result is a port of the game that makes for a welcome change from just sitting in traffic all day. If only the car were self-driving.