Fallout 4 would've been a very different game if it came out in 1984 on an Apple 2.
The team used an open-source editor called Outlaw Editor to create this demo. It's all made up of 8-bit graphics (allowing only colours Black, White, Green, Purple, Orange, and Blue), and runs on an actual Apple 2 computer. They even added music and sound effects afterwards.
Take a look at the finished project.