How do i stop a part from leaving a specified area?

Region 3

Region3 is a form of a datatype and is primarily used to detect if a player is in a certain area. this is used to play music in a certain area, or make a safe zone.

It sounds cumbersome but It's is useful in a lot of games, like my own.

First create a local script, preferably in the starter player.

Create a block that fills your place, another-words create a block where you want the part to stay in. Name it RegionPart

Now enough talking let's get to scripting!

First we need to reference our Region in a variable. And find it's original position so we can object the part to it's general position when it leaves the region.

local Part = game.Workspace.Part -- The parts main objective is to stay in the region
local RegionPart = game.Workspace.RegionPart -- The Part that we created earlier.

local OriginalPosition = Part.Position

local pos1 = RegionPart.Position - (RegionPart.Size / 2) -- Calulating the first position
local pos2 = RegionPart.Position - (RegionPart.Size / 2) -- Calculating The Seconf Position

local Region = Region3.new(pos1, pos2) -- Creating the region itself

while wait() do
	local IsPartInRegion = workspace:FindPartsInRegion3(Region,(-- Insert the parts you want to ignore)
	
	for i, part in pairs(IsPartInRegion) do -- looping through..
		if part.Parent:FindFirstChild("Part") then
			print("Part is currently in the region")
		else
			print("Part is not in the region!")
			Part.Position = OriginalPosition
		end
	end
end

There you have it!

If you have problems with the script, please reply. I'm home 99% of the time anyway [Joking] All jokes aside; stay safe!