http://www.youtube.com/watch?v=s8VkCwhxY-YLink to mod in question(You need to run Skulltag at at least 800x600 or the Skill/Perk Select is too tiny to read.)Even on the easiest setting, Doom 2 gets ridiculously hard (and fun) with this in Single Player. I'd love to try out a multiplayer Co-op/Deathmatch with this sometime.