I've skimmed hundreds of pages on this thread in hopes someone else has been searching for the same game, but it seems I'm not so lucky! So!
The game I'm looking for was an old internet browser game from CoolMath.com or an extremely similar online gaming website back in the late 90's/early 2000's; it was a top down pixel adventure style game with a vague Halloween/monster kind of theme to it where you played someone that had to retrieve monster dolls [ specifically I remember a Mummy, Vampire, Frankenstein, and Witch doll- but there we're more, I could never play/beat the game well enough to retrieve them all without dying ]and return them to a little girl in a small village. There was a vast forest surrounding the village along with a swamp that you had to go through and find the various locations where the dolls had been taken to- I vividly remember the Mummy doll being in a house/cellar at the very lower bottom of the screen, but was surrounded by bats that attacked you the second you entered the house- so you either had to fight your way through them, or run in and grab it and run out before dying.
I believe, as you got the dolls and returned them, you we're given either a new power-up or a weapon that made you stronger and better able to get the other dolls. I do remember the colors being very dark and the game was extremely hard for a web-browser game. Like I said, I could never finish it, but I was obsessed with playing it as a kid.
The memory of this game has haunted me for years and I'd love to try and find it again since all web searches have taken me nowhere- well, they actually keep bringing me back to this thread. Guess that's why I'm finally caving and asking.