public void UnlinkTile()
{
GameTile removedTile = _tileStack.Pop();
if (removedTile.GetType() != typeof(NumberTile))
{
PathTotal = (int)_stf.Eval(_equationGenerator.GetEquationString(this, true));
}
removedTile.EmptyTile(_goalTotal);
_goalTotal.CheckComplete();
pathUpdatedEvent.Invoke();
}