To see inside, open 'BCW.ASM' with a text editor such as Notepad. This looks like opening BCW.ASM in Notepad. Game Source Code Collection has a total of 241 titles registered.

The game’s source code was made available to the public all the way back in 1997, which has led to experiments such as this one.

Most code editors are similar to notepad.exe in that they are "text editors", but unlike notepad.exe they have functionality built into them to send the code into the compiler.

Over the decades, people have managed to get the original Doom to run on all sorts of interesting devices, and a fan ports the game to Notepad.

Representative Image (Credit -- Bethesda) Windows Notepad is a simple text editor that has been around since the 1980s. This software commonly allows users to create and edit basic text documents.

Windows Notepad is a simple text editor that has been around since the 1980s. This software commonly allows users to create and edit basic text documents.