Changing Scene Es6

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class SceneA extends Phaser.Scene {

    constructor ()
    {
        super({ key: 'sceneA' });
    }

    preload ()
    {
        this.load.setBaseURL('https://cdn.phaserfiles.com/v385');
        this.load.image('face', 'assets/pics/bw-face.png');
    }

    create ()
    {
        this.face = this.add.image(400, 300, 'face');

        this.input.manager.enabled = true;

        this.input.once('pointerdown', function () {

            this.scene.start('sceneB');

        }, this);
    }

}

class SceneB extends Phaser.Scene {

    constructor ()
    {
        super({ key: 'sceneB' });
    }

    preload ()
    {
        this.load.setBaseURL('https://cdn.phaserfiles.com/v385');
        this.load.image('arrow', 'assets/sprites/longarrow.png');
    }

    create ()
    {
        this.arrow = this.add.sprite(400, 300, 'arrow').setOrigin(0, 0.5);

        this.input.once('pointerdown', function (event) {

            this.scene.start('sceneC');

        }, this);
    }

    update ()
    {
        this.arrow.rotation += 0.01;
    }

}

class SceneC extends Phaser.Scene {

    constructor ()
    {
        super({ key: 'sceneC' });
    }

    preload ()
    {
        this.load.setBaseURL('https://cdn.phaserfiles.com/v385');
        this.load.image('mech', 'assets/pics/titan-mech.png');
    }

    create ()
    {
        this.add.sprite(Phaser.Math.Between(300, 600), 300, 'mech');

        this.input.once('pointerdown', function (event) {

            this.scene.start('sceneA');

        }, this);
    }

}

var config = {
    type: Phaser.AUTO,
    width: 800,
    height: 600,
    backgroundColor: '#000000',
    parent: 'phaser-example',
    scene: [ SceneA, SceneB, SceneC ]
};

var game = new Phaser.Game(config);