These are custom created/modified firmwares and loaders for your favourite slot-2 flash carts. Please note that these are generally unsupported by the flash cart manufacturer(s) so you should use them at your own risk.
Only thing drive me crazy is all these new horror games nowadays is its so dark, all time. I can't even play them. I understand they trying to create spooky but be creative a little, not just darkness with pop out scare scenes.