if (this.name != undefined) {
				  //clicked a non-empty
				  if (holding == null) {
				    //PICK U0
				  } else {
				    //SWAP
				  }


                  //clicked a non-empty tile while maybe holding something.
                  
				  //so we'll pick up what we clicked while putting down what was held.
				  var previousHeld = null;
                  grabbedName = this.name;
                  if (holding != null) {
                    //hexes[puzzleTiles[holding][0]][puzzleTiles[holding][1]].name = grabbedName;
					previousHeld = hexes[puzzleTiles[holding][0]][puzzleTiles[holding][1]];
					previousHeld.name = grabbedName;
                    //hexes[puzzleTiles[holding][0]][puzzleTiles[holding][1]].draw(c);
                    this.name = holding;                    
					holding = null;
                  } else {
                    holding = grabbedName;
                  }
                  puzzleTiles[this.name][0] = this.column;
                  puzzleTiles[this.name][1] = this.row;
				  if (previousHeld != null) previousHeld.draw(c);
                  this.draw(c);
                  sayIfWon(c);
                  return;
                }