Stuff that alter the Game/s as a whole, including Custom Campaigns and Levels. These Mods don't change much in terms of Difficulty, but they do transform the entirety of the Game, even if it's small changes like "Tiny enemies for Serious Sam HD" Mod, see them as alternative experiences.

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Serious Carnage Remake: This Mod not only changes the Weapons and Sam's Speed, but it also changes the Enemy Layouts of the Original Croteam Levels, so it's somewhat its own thing.

Tiny enemies for Serious Sam HD: Affects all Vanilla Enemies, but not Custom ones (didn't affected Kleers in Extended though).