Elementalism is a DOOM 2 Project, quite a big one because maps are really large with hundreds of monsters arriving to the scene (do not be fooled by a number at the begginning of each map, there are way more of them!). Maps are also very impressive and unfortunately for lots of people with weaker machines, most of the maps have an incredible attention to details, there are lots of objects and fighting is also pretty tense. Difficulty of the levels is never low, especially on Ultra-Violence where it may become quite a slugfest because of the monster's amount that might suddenly appear, thus I had to lower a difficulty because there were way too many demons to handle. Levels also contain custom monsters added to the mappack itself, for example here we will meet water version of Baron of Hell, poison variant of Imps and Aracnorbs, these are flying Arachnotrons, very annoying in large numbers. Unfortunately there are some compatibility issues that you must overcome - with some gameplay modifications like Project Brutality, you must type cheats to give yourself a weapon at the beginning of each level, this is a must.