Isaiah St. John

Instead of clicking on an empty space, you would click on a stone to indicate you want to swap the stone with another stone. The adjacent stones would become highlighted....

They would be treated like one stone for all intents and purposes until the threshhold is reached that triggers a black hole.

Yes, you need to be in a secure context. See: https://developer.mozilla.org/en-US/docs/Web/API/MediaDevices/getUserMedia#security