TextChatMessage

local Players = game:GetService("Players")
local TextChatService = game:GetService("TextChatService")

local customChannel: TextChannel = Instance.new("TextChannel")
customChannel.Parent = TextChatService:WaitForChild("TextChannels")

customChannel.OnIncomingMessage = function(message: TextChatMessage)
  if string.find(message.Metadata, "Error") then
    local overrideProperties = Instance.new("TextChatMessageProperties")
    overrideProperties.Text = string.format("<font color='rgb(255,0,0)'>%s</font>", message.Text)
    return overrideProperties
  elseif string.find(message.Metadata, "Info") then
    local overrideProperties = Instance.new("TextChatMessageProperties")
    overrideProperties.Text = string.format("<font color='rgb(0, 255, 150)'>%s</font>", message.Text)
    return overrideProperties
  end

  return nil
end

Players.LocalPlayer.CharacterAdded:Connect(function()
  customChannel:DisplaySystemMessage("This is an error!", "Game.Error.Generic")
  customChannel:DisplaySystemMessage("Could not find save data!", "Game.Error.SaveDataNotFound")

  customChannel:DisplaySystemMessage("You won the game!", "Game.Info.Win")
  customChannel:DisplaySystemMessage("You lost the game!", "Game.Info.Lose")
end)