A YouTuber nicknamed Danny Spencer posted a video showing a calculator he made based on the cult retro shooter Doom.

Curiosity created a location where he created multi-level platforms and a control panel with buttons responsible for entering numbers from zero to nine. Each platform is a screen for the output of numbers played by monsters.

There are a total of seven platforms on the map: two for displaying two-digit terms and three for outputting a three-digit sum. When a certain number is clicked, monsters from the basement appear on the platform, and as a result, they are sorted by a certain number.

The Danny Spencer calculator works exceptionally, but has very little functionality. First, he just knows how to compose. Second, when adding two numbers the total should not be more than 999. Thirdly, the calculator does not have a reset button, which means that for a new expression you have to manually clear the area with the help of a machine gun.

Danny Spencer’s YouTube video garnered more than 22,000 views, nearly 250 likes, and several dozen comments in just a few days.