The start of the game I was making on my Arduino at Nodebots Day DC. I had to leave early due to camping, so I didn't get to finish :(

animations.js

var five = require('johnny-five')
  , board
  , pot
  , button, buttonStatus
  , pin = 9 // starting pin
  , animation

board = new five.Board();

var speed = 100

board.on('ready', function() {
  button = new five.Button(13);
  button.on('down', function() {
    buttonStatus = true;
    flash(pin);
  });
  button.on('up', function() {
    buttonStatus = false;
  });

  pot = new five.Sensor({
    pin: 'A3',
    freq: 250
  });

  pot.on('read', function(err, val) {
    speed = (val * 2000 / 1023) + 50;
  });

  turnOn();
});

var flash = function(pin) {
  clearInterval(animation);
  var on = false;
  animation = setInterval(function() {
    if (on) {
      clear();
      on = false;
    }
    else {
      pinsOn(pin);
      on = true;
    }
  }, speed);
  setTimeout(turnOn, 2000)
}

var clear = function() {
  for (var i = 2; i <= 9; i++)
    (new five.Led(i)).off();
}

var pinsOn = function(pin) {
  for (var i = 9; i >= pin; i--)
    (new five.Led(i)).on();
}

var turnOn = function() {
  clearInterval(animation);
  animation = setInterval(function() {
    (new five.Led(pin)).on();
    if (pin == 2) {
      clearInterval(animation);
      turnOff();
    }
    pin--;
  }, speed);
}

var turnOff = function() {
  clearInterval(animation);
  animation = setInterval(function() {
    (new five.Led(pin)).off();
    if (pin == 9) {
      clearInterval(animation);
      turnOn();
    }
    pin++;
  }, speed);
}