Best way to prevent flying, noclip, and teleportation exploits?

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In my opinion, the best way of detecting flying/teleporting on the server is to do magnitude checks. This is where you take the position of the HumanoidRootPart or the Torso, then again the next second or so. Then you can determine whether to kick the player by working out if they’ve travelled farther than they can normally walk.

The way you script this varies on what kind of game you’re making and might have to make necessary checks, here’s an edited version of the magnitude check I use in my games:

local players = game:GetService("Players")
local humanoidStates = {0, 3, 5, 7, 8, 10, 12, 15}

function loadChararacter(player)
	while true do
		local a, e = pcall(function()
			if not player.Character then return end
			local root = player.Character:FindFirstChild("HumanoidRootPart")
			local humanoid = player.Character:FindFirstChild("Humanoid")
			if not root or not humanoid then return end
			local previousPosition = root.Position
			local previousState = humanoid:GetState()

			delay(1, function()
				if not player.Character then return end
				if not root or not humanoid then return end
				if (root.Position - previousPosition).Magnitude >= 0 then -- 0 is how many studs the player gets to travel before getting kicked, increase this number if you get false positives.
					wait(0.1)
					if table.find(humanoidStates, humanoid:GetState().Value) or table.find(humanoidStates, previousState.Value) then return end -- Checks if player is falling.
					if humanoid.FloorMaterial ~= Enum.Material.Air or humanoid.Health == 0 then return end -- Checks if player is falling or dead.
					player:Kick(string.format("You just travelled %s studs in 1 second, kinda sus bro.", math.round((root.Position - previousPosition).Magnitude)))
				end
			end)
		end)

		if not a then
			print(string.format("anti exploit error: %s", tostring(e)))
		end

		wait(1)
	end
end

players.PlayerAdded:Connect(function(player)
	if player.Character then loadChararacter(player) end
	player.CharacterAdded:Connect(function(character)
		loadChararacter(player)
	end)
end)
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