I’m working on an older version of Roblox, messing around with it. (2007 client, to be exact.) An issue I ran into is that when the game is ran on a server, everything will duplicate per client, so if there’s 1 person, there’s 1 duplicate of everything in the game, leading to immense lag, and tons of bugs (I have no clue why it does this.) Starting with the teams:

local teams = game.Teams:GetChildren()

local save
local destroy

local debounce = false
local counter = 1

local function destroyDuplicate()
    while counter < 6 do
        for i, team in pairs(teams) do
            if string.match(team.Name, counter) and debounce == false then
                save = team
                debounce = true
            elseif string.match(team.Name, counter) and debounce == true then
                destroy = team
                if save ~= destroy then
                    destroy:Remove()
                end
                debounce = false
                counter = counter + 1
                save = nil
                destroy = nil
            end
        end
    end
        counter = 1
end

destroyDuplicate()

game.Teams.ChildAdded:connect(destroyDuplicate)

This code only deletes 1 duplicate. It does not delete multiple, and also when a new duplicate is made mid game, it doesn’t delete either.