How to make death counter and make screen black out?

Basically, in my game I want it to make it so every time you die the screen goes black and says like FAILED and adds one death to the leaderboard. The thing is, I have NO IDEA how to do it. I also want to make the screen a bit darker the entire time you're playing. Can someone help? The only thing I've done so far is put the camera in first person lock.

Here how you can make a death counter on the leaderboard. Put this script in ServerScriptService.

game.Players.PlayerAdded:Connect(function(player)

    -- Detect for leaderstats

    local leaderstats

    if player:FindFirstChild("leaderstats") then
        leaderstats = player.leaderstats
    else
        leaderstats = Instance.new("Folder")
        leaderstats.Name = "leaderstats"
        leaderstats.Parent = player
    end

    -- create deaths value

    local deaths = Instance.new("IntValue")
    deaths.Name = "Deaths"
    deaths.Parent = leaderstats

    -- detect character added.

    player.CharacterAdded:Connect(function(char)
    -- detect humanoid died.
        char.Humanoid.Died:Connect(function()
            deaths.Value = deaths.Value + 1 -- add 1 value to values
        end)
    end)
end)

-- work in progress

Hello!

Here is the "screen blackout" script you are looking for. Please note, you are expected to supply the gui yourself.

--localscript inside the gui inside startergui
local background = script.Parent.Background -- the background that it will fade to black with, can be a textlabel with no text in it
local text = script.Parent.TextLabel -- the "Failed!" textlabel thing

local player = game.Players.LocalPlayer
local character = player.Character or player.CharacterAdded:Wait()
local hum = character:WaitForChild("Humanoid")

local ts = game:GetService("TweenService") --tweenservice for smooth animations
local info = TweenInfo.new(3,Enum.EasingStyle.Cubic,Enum.EasingDirection.Out) 
local infotext = TweenInfo.new(1,Enum.EasingStyle.Cubic,Enum.EasingDirection.In) 
--change the 3 to whatever time you want it to delay
hum.Died:Wait() --waits for the humanoid to die

local tween = ts:Create(background,info,{BackgroundTransparency = 0})
tween:Play()
tween.Completed:Wait()
wait(0.5)

local tween = ts:Create(text, infotext,{TextTransparency = 0})
tween:Play()
tween.Completed:Wait()

This also doubles as the "screen darker the entire time" because you can set the background gui to something like 0.8 backgroundtransparency.

I hope this helped.

If you have any questions, ask them below!