Phaser 2 - Cheatsheet

Game.Overworld = function () {};
Game.Overworld.prototype.init = function (obj) {};
Game.Overworld.prototype.preload = function () {};
Game.Overworld.prototype.create = function () {};
Game.Overworld.prototype.update = function () {};

this.gameInstance = new Phaser.Game(
    width,
    height,
    Phaser.AUTO,
    "game",
    null,
    false,
    false
);
// adicionando states do jogo
this.gameInstance.state.add("overworld", Game.Overworld);
this.gameInstance.state.add("battle", Game.Battle);