**Objective:** Build an app that is functionally similar to this: <ahref="https://codepen.io/freeCodeCamp/full/obYBjE"target="_blank"rel="noopener noreferrer nofollow">https://codepen.io/freeCodeCamp/full/obYBjE</a>.
**User Story:** I am presented with a random series of button presses.
**User Story:** Each time I input a series of button presses correctly, I see the same series of button presses but with an additional step.
**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.
**User Story:** I can win the game by getting a series of 20 steps correct. I am notified of my victory, then the game starts over.
**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`.
When you are finished, include a link to your project on CodePen and click the "I've completed this challenge" button.
You can get feedback on your project by sharing it on the <ahref="https://forum.freecodecamp.org/c/project-feedback/409"target="_blank"rel="noopener noreferrer nofollow">freeCodeCamp forum</a>.