have you ever wanted to have a rat (or multiple) as a weapon?
to use this absolutely amazing mod, you first need gzdoom, you can get it from here: Zdoom.org.
if you own doom on steam, you can extract the zip on your doom 2 folder. should be located on "c:\program files(x86)\steam\steamapps\common\doom 2\base", if you created a folder for gzdoom, don't forget to put DOOM2.WAD in that folder as well, as it might not detect it in the "\base" folder.
to open the mod you need to either drag drop it on top of gzdoom.exe, use zdl launcher (you can get it from here Github.com), or set up the .bat file, which comes with doom 2, you just need to change ".\base\dosbox" to ".\(gzdoom folder name)\gzdoom", and then "-file .\(mod folder)\(mod file name)". if you are gonna use the .bat file method, i recommend putting it either where you installed gzdoom, or in a folder inside the gzdoom folder.