ServerStorage

A container whose contents are only accessible on the server. Objects descending from ServerStorage will not replicate to the client and will not be accessible from LocalScripts.

As ServerStorage is a service it can only be accessed using the DataModel.GetService method.

By storing large objects such as maps in ServerStorage until they are needed, network traffic will not be used up transmitting these objects to the client when they join the game.

Scripts will not run when they are parented to ServerStorage, although ModuleScripts contained within can be accessed and ran. It is recommended developers use ServerScriptService to hold Scripts they wish the server to execute.

Note that as the contents of ServerStorage can only be accessed by the server, its contents will need to be parented elsewhere (such as Workspace) before clients can access them. Developers who require a container that is accessible by both the server and client are advised to use ReplicatedStorage instead.

local ServerStorage = game:GetService("ServerStorage")

local ROUND_TIME = 5

local map1 = Instance.new("Model")
map1.Name = "Map1"
map1.Parent = ServerStorage

local map2 = Instance.new("Model")
map2.Name = "Map2"
map2.Parent = ServerStorage

local map3 = Instance.new("Model")
map3.Name = "Map3"
map3.Parent = ServerStorage

local maps = { map1, map2, map3 }
local RNG = Random.new()
local currentMap = nil
local lastPick = nil

while true do
	print("New map!")

	-- remove current map
	if currentMap then
		currentMap:Destroy()
	end

	-- pick a map
	local randomPick = nil
	if #maps > 1 then
		repeat
			randomPick = RNG:NextInteger(1, #maps)
		until randomPick ~= lastPick
		lastPick = randomPick
	end

	-- fetch new map
	local map = maps[randomPick]
	currentMap = map:Clone()
	currentMap.Parent = workspace

	task.wait(ROUND_TIME)
end