During my study in Game Technology major, I always became the game designer. I decided the story, the game mechanic, and how the level of the game will be. I made a mock up of the game and then distributed it to my partners (programmer and artist). Most of the time my friends and I created a mobile games. As a game designer, doesn't mean that I can not code for the game. I am able to create some simple games using Unity 3D, such as endless runner, role-playing game, quiz, or educational game, because I have been using it in the last 2 years.