From LPA member,GoldFire..
"So you can do the cheat the same way, but in order to keep the rick roll from showing up, you need to modify a few things in the Chrome or Safari web inspector.
Right click on one of the completed images, click Inspect Element. Change where it says class="square completed" to class="square" on 2 of the div elements that have "completed" in the class. Then enter the password and it'll solve the puzzle."