Help making win leaderboard

Help and Feedback Scripting Support
#1

So I have a checkpoint system for my game and I wanna make a global leaderboard for when a player completes all stages and im thinking I need to make a win leaderstat then add 1 to it when the player goes from the first stage to the last stage. So how would I detect when the player goes from the first stage to the last stage?

any help is appreciated.

Checkpoint script

local Players = game:GetService("Players")
local MarketplaceService = game:GetService("MarketplaceService")
local ReplicatedStorage = game:GetService("ReplicatedStorage")
local SkipStage = ReplicatedStorage:WaitForChild("SkipStage")
local ResetStage = ReplicatedStorage:WaitForChild("ResetStage")
local DataStoreStore = game:GetService("DataStoreService")
local CampDataStore = DataStoreStore:GetDataStore("CampDataStore")

local Checkpoints = workspace:WaitForChild("Checkpoints")
local inGameStartupPlayers = {}
local CurrentStage = {}
local TouchDb = {}

local ProductId = 1372865241

local function NewCharacter(player, char)
	local TempCurrentStage = CurrentStage[player.UserId]
	if TempCurrentStage ~= nil then
		local TempCheckpoint = Checkpoints:FindFirstChild(TempCurrentStage)
		if TempCheckpoint ~= nil then
			repeat wait(0.1) until char.PrimaryPart ~= nil
			char:SetPrimaryPartCFrame(CFrame.new(TempCheckpoint.Position + Vector3.new(0, 3, 0)) * CFrame.Angles(0, math.rad(TempCheckpoint.Orientation.Y) + math.rad(90), 0))
		end
	end
end

local function NewPlayer(player)
	local success, stage = pcall (function()
	return (CampDataStore:GetAsync(player.UserId)) or 1
end)
	CurrentStage[player.UserId] = stage

	local leaderstats = Instance.new("Folder", player)
	leaderstats.Name = "leaderstats"
	local Stage = Instance.new("IntValue", leaderstats)
	Stage.Name = "Camp"
	Stage.Value = stage

	local TempChar = player.Character
	if TempChar ~= nil then
		NewCharacter(player, TempChar)
	end
	player.CharacterAdded:Connect(function(char)
		NewCharacter(player, char)
	end)
end

Players.PlayerAdded:Connect(function(player)
	if inGameStartupPlayers[player] == nil then
		NewPlayer(player)
	end
end)

Players.PlayerRemoving:Connect(function(player)
	local success = pcall(function()
		CampDataStore:SetAsync(player.UserId, CurrentStage[player.UserId])
	end)
	CurrentStage[player.UserId] = nil
end)

SkipStage.OnServerInvoke = function(player)
	local connection
	local leaderstats = player:FindFirstChild("leaderstats")
	if leaderstats ~= nil then
		local Stage = leaderstats:FindFirstChild("Camp")
		if Stage ~= nil then
			if #Checkpoints:GetChildren() ~= Stage.Value then
				local PurchaseResult = "Purchase Failed"
				connection = MarketplaceService.PromptProductPurchaseFinished:Connect(function(userId, productId, purchased)
					if player.UserId == userId and productId == ProductId then
						if purchased == true then
							PurchaseResult = "Success!"
						end
					end
					connection:Disconnect()
				end)
				MarketplaceService:PromptProductPurchase(player, ProductId)
				repeat wait(0.1) until connection.Connected == false or Players:GetPlayerByUserId(player.UserId) == nil
				return PurchaseResult
			else
				return "You've Reached Final Camp!"
			end
		end
	end
end

MarketplaceService.ProcessReceipt = function(recieptInfo)
	if recieptInfo.ProductId == ProductId then
		local player = Players:GetPlayerByUserId(recieptInfo.PlayerId)
		if player ~= nil then
			CurrentStage[player.UserId] = CurrentStage[player.UserId] + 1
			local leaderstats = player:FindFirstChild("leaderstats")
			if leaderstats ~= nil then
				local Stage = leaderstats:FindFirstChild("Camp")
				if Stage ~= nil then
					Stage.Value = CurrentStage[player.UserId]
				end
			end
			local TempChar = player.Character
			if TempChar ~= nil then
				NewCharacter(player, TempChar)
			end
			return Enum.ProductPurchaseDecision.PurchaseGranted
		end
	end
	return Enum.ProductPurchaseDecision.NotProcessedYet
end

ResetStage.OnServerEvent:Connect(function(player)
	CurrentStage[player.UserId] = 1
	local TempLeaderstats = player:FindFirstChild("leaderstats")
	if TempLeaderstats ~= nil then
		local TempStage = TempLeaderstats:FindFirstChild("Camp")
		if TempStage ~= nil then
			TempStage.Value = 1
		end
	end
	NewCharacter(player, player.Character)
end)

for i,v in pairs(Checkpoints:GetChildren()) do
	local StageNum = tonumber(v.Name)
	v.Touched:Connect(function(hit)
		local char = hit.Parent
		if char ~= nil then
			local Humanoid = char:FindFirstChildOfClass("Humanoid")
			if Humanoid ~= nil and Humanoid.Health > 0 then
				local player = Players:GetPlayerFromCharacter(char)
				if player ~= nil and (TouchDb[player.UserId] or 0) + 1 <= os.time() then
					TouchDb[player.UserId] = os.time()
					local TempCurrentStage = CurrentStage[player.UserId]
					if TempCurrentStage == StageNum - 1 then
						CurrentStage[player.UserId] = StageNum
						local TempLeaderstats = player:FindFirstChild("leaderstats")
						if TempLeaderstats ~= nil then
							local TempStage = TempLeaderstats:FindFirstChild("Camp")
							if TempStage ~= nil then
								TempStage.Value = StageNum
							end
						end
					end
				end
			end
		end
	end)
end

inGameStartupPlayers = Players:GetPlayers()
for i,v in pairs(inGameStartupPlayers) do
	spawn(function()
		NewPlayer(v)
	end)
end

game:BindToClose(function()
	for i,v in pairs(Players:GetPlayers()) do
		CampDataStore:SetAsync(v.UserId, CurrentStage[v.UserId])
	end
	wait(1)
end)

inGameStartupPlayers = {}
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