Main Script

local ds = game:GetService("DataStoreService"):GetDataStore("SaveData")
game.Players.PlayerAdded:Connect(function(plr)
    local leaderstats = Instance.new("Folder",plr)
    leaderstats.Name = "leaderstats"
    local Stage = Instance.new("IntValue",leaderstats)
    Stage.Name = "Stage"
    wait()
    local plrkey = "id"..plr.userId
    local save1 = plr.leaderstats.Stage
    local GetSaved = ds:GetAsync(plrkey)
    if GetSaved then
        save1.Value = GetSaved[1]
    else
        local NumberForSaving = {save1.Value}
        ds:GetAsync(plrkey, NumberForSaving)
    end
end)

game.Players.PlayerRemoving:Connect(function(plr)
    ds:SetAsync("id"..plr.userId,{plr.leaderstats.Stage.Value})
end)

game.Players.PlayerAdded:Connect(function(plr)
    plr.CharacterAdded:Connect(function(char)
        local Checkpoints = workspace:WaitForChild("Checkpoints"):GetChildren()
        for i = 1, #Checkpoints do
            Checkpoints[i].Touched:Connect(function(hit)
                local humanoid = hit.Parent:FindFirstChild("Humanoid")
                if not humanoid then return end
                local Player = game.Players:GetPlayerFromCharacter(hit.Parent)
                if Checkpoints[i].Stage.Value < Player.leaderstats.Stage.Value then return end
                Player.leaderstats.Stage.Value = Checkpoints[i].Stage.Value
            end)
        end
        plr.Character.Humanoid.Died:Connect(function()
            wait(game.Players.RespawnTime + 0.0001)
            plr.Character.Head.CFrame = game.Workspace.Checkpoints:WaitForChild(plr.leaderstats.Stage.Value).CFrame + Vector3.new(0,8,0)
        end)
    end)
end)