Where does this script execute the mini game ending?

Please ignore how messy it is. But i'm trying to work out how the script finds out whether the mini game has ended. It works fine, but i'm trying to add certain features, for example when the last person is left alive they will win the game, instead of my other script still counting to 0 whilst nothing is going on.

But to achieve this I need to find out how the script is ended first of all, and its working out to be quite a task.

Thanks in advance.

disasters = {"ColourDrop","Pitfall","Murderer","SwordFight"}



countdownTime = 45 
disasterTime = 10


countdownMessage = "The next disaster will occur in %s seconds."
disasterMessage = "Survive: %s"


items = {}
leaderboard = game.Workspace:findFirstChild("BTS Leaderboard") 
local w = game.Workspace:getChildren()
for i=1,#w do
    if w[i].Name == "leaderboard" and w[i]:findFirstChild("running") ~= nil and w[i]:findFirstChild("coins") ~= nil then
        leaderboard = w[i]
    end
        wait(0.2)

end
for i=1,#disasters do
    local item = game.Lighting:findFirstChild(disasters[i])
    if item ~= nil then
        item.Parent = nil
        table.insert(items, item)
    else
        print("Error! ", disasters[i], " was not found!")
    end
    wait(0.2)
end


function chooseDisaster()
    return items[math.random(#items)]
end


function sethint(text)
    local hint = game.Workspace:findFirstChild("hint")
    if (hint ~= nil) then
        hint.Text = text
    else
        print("Hint does not exist, creating...")
        h = Instance.new("Hint")
        h.Name = "hint"
        h.Text = text
        h.Parent = game.Workspace
    end

end


function removeHint()
    hint = game.Workspace:findFirstChild("hint")
    if (hint ~= nil) then hint:remove() end
end


function countdown(time)
    while (time > 0) do
        wait(1)
        time = time - 1
        _G.countdowngo = ("Game starting in: "..time)
    end
    removeHint()
    return true
end


while true do
    countdown(countdownTime)
        _G.countdowngo=countdownTime
    if leaderboard ~= nil and leaderboard:findFirstChild("running") and leaderboard:findFirstChild("coins") then 
        leaderboard.coins.Value = 5
        leaderboard.running.Value = true

    end


    local m = chooseDisaster():clone()


    if disasterMessage ~= nil then
        _G.countdowngo = ("Game: ".. m.Name)
        wait(2)
    end


    m.Parent = game.Workspace
    m:makeJoints()
    wait(disasterTime)
    m:remove()


    if leaderboard ~= nil then
        leaderboard.running.Value = false
    end
    wait(0.2)
end