New Twiddle

components.counter\.hbs

<div style="border: 1px solid black; padding: 10px;">
  <p>Create a simple counter that counts up when you click "Count Up" and counts down when you click "Count Down"</p>
  Counter: 0

  <div>
    <button>Count Down</button>
    <button>Count Up</button>
  </div>
</div>

components.counter\.js

import Component from '@glimmer/component';

export default class CounterComponent extends Component {
}

components.todos\.hbs

<div style="border: 1px solid black; padding: 10px;">
  <p>Create a to do list that lets you add and remove items from the list. When one is added, clear the input.</p>

  <form>
    {{! Put your input in this form }}
  </form>

  <ul>
		{{! Put your todos in this list }}
  </ul>
</div>

components.todos\.js

import Component from '@glimmer/component';

export default class TodosComponent extends Component {
}

controllers.application\.js

import Controller from '@ember/controller';

export default class ApplicationController extends Controller {}

templates.application\.hbs

<Counter />

<div style="height: 50px;"></div>

<Todos />

twiddle\.json

{
  "version": "0.17.1",
  "EmberENV": {
    "FEATURES": {},
    "_TEMPLATE_ONLY_GLIMMER_COMPONENTS": false,
    "_APPLICATION_TEMPLATE_WRAPPER": true,
    "_JQUERY_INTEGRATION": true
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/3.5.1/jquery.js",
    "ember": "3.18.1",
    "ember-template-compiler": "3.18.1",
    "ember-testing": "3.18.1"
  },
  "addons": {
    "@glimmer/component": "1.0.0"
  }
}