The Edge of Time 1.8r1

DOOM is one of the oldest FPSes in existence, and its engine is famously so robust that it can run on pretty much anything and also create pretty much anything.  From FPSes to RPGs to companions to a city living game, it has a ton of different mods that can all do different things. One of the best ones out there is The Edge of Time, a mod that changes a ton of its base mechanics.

To install The Edge of Time, you need to have ZDoom and move the WAD file into the GZDoom folder, which is pretty par for the course for DOOM mods.

When you first boot this game up, you will likely be disorienting as all hell, no pun intended. The UI has been completely overhauled, cluttering up the previously simple UI. The main gameplay loop of this mod is collection. Unlike base DOOM, there are a ton of different collectibles that will give you an edge as you collect them.

The creator has stated that the Konami era of games was a big inspiration and it shows. You collect coins to get a health bonus so you can murder demons more effectively, demonds drop a ton of different coins and ammo that both give you points, which will spawn powerups once you collect enough so you can murder more efficiently.

All in all, The Edge of Time is a fascinating mod that really changes the gameplay loop. The most impressive thing is how it doesn't collapse under its own weight.