Warning you need to turn on beta apis, custom camera features, and custom creator features in experiments in order to work. To make mobs smaller/bigger look at them then left click. To make yourself smaller/bigger look into the sky and left click. Currently this addon works very well In multiplayer and DOES actually decrease/increase hitboxes the only bug/issue is when small your hitting box is a bit above you. I have made another addon that goes with this if you want that can give you first person, more/less reach less faster/more faster jump higher/less higher fall damage more/less and more. when big or small if you guys want this then let's reach 10k downloads!