platformed-create-2.js

function create() {
    this.add.image(400, 300, 'sky');

    // Add this code below until the "stop" comment
    var platforms = this.physics.add.staticGroup();

    platforms
        .create(400, 568, 'ground')
        .setScale(2)
        .refreshBody();

    platforms.create(600, 400, 'ground');
    platforms.create(50, 250, 'ground');
    platforms.create(750, 220, 'ground');
    // stop
}