Por Favor, me digam se existe algum erro aqui... Obrigado

Google Translate: Please, tell me if there is some mistake here … thank you

function OnGUI() {
if (!controlePause)
{
GUI.Box(Rect(0,0,Screen.width,Screen.height),"JOGO PAUSADO");

}
{
GUI.Button(Rect(100,50,posX,posZ),"VOLTAR AO JOGO")
Application.LoadLevel("Ilha");
}
{
 GUI.Button(Rect(100,50,posX,posZ),"SAIR")
 Application.Quit();
}

You open and close one key for each GUI.Button for what?
You don’t need this, unless you want to do it with the if statement(not mandatory).

Hope helped you. See you.