amethyst/apps/example_game/lib/example/game.ex

defmodule Example.Game do
  require Logger
  use Amethyst.API.Game, meta: [default: true]

  @impl true
  def instantiate() do
    {:ok, [:hello]}
  end

  @impl true
  def login(from, cfg, state) do
    Logger.info("Player logged in from #{inspect(from)}: #{inspect(cfg)}")
    {:ok, state}
  end
end