**Objective:** Build a [CodePen.io](https://codepen.io) app that is functionally similar to this: [https://codepen.io/freeCodeCamp/full/obYBjE](https://codepen.io/Em-Ant/full/QbRyqq/).
**User Story:** I hear a sound that corresponds to each button both when the series of button presses plays, and when I personally press a button.
**User Story:** If I press the wrong button, I am notified that I have done so, and that series of button presses starts again to remind me of the pattern so I can try again.
**User Story:** I can see how many steps are in the current series of button presses.
**User Story:** If I want to restart, I can hit a button to do so, and the game will return to a single step.
**User Story:** I can play in strict mode where if I get a button press wrong, it notifies me that I have done so, and the game restarts at a new random series of button presses.
**Hint:** Here are mp3s you can use for each button: `https://s3.amazonaws.com/freecodecamp/simonSound1.mp3`, `https://s3.amazonaws.com/freecodecamp/simonSound2.mp3`, `https://s3.amazonaws.com/freecodecamp/simonSound3.mp3`, `https://s3.amazonaws.com/freecodecamp/simonSound4.mp3`.