gistfile1.js

// Bot for http://gabrielecirulli.github.io/2048/

FakeActuator = function() {}

FakeActuator.prototype.actuate = function () {
}

score = 0;
max = 0;
while (max < 1024) {
    manager = new GameManager(4, KeyboardInputManager, FakeActuator)
    move = 0;
    while (!manager.over) {
        manager.move(move);
        move = (move + 1) % 4;
    }
    max = 0;
    for (var i in manager.grid.cells) {
        var row = manager.grid.cells[i];
        for (var j in row) {
            cell = row[j];
            if (cell.value > max) {
                max = cell.value;
            }
        }
    }
    console.log(max);
}

manager.actuator = new HTMLActuator
manager.actuate()

Fix for the GameManager constructor 😄

manager = new GameManager(4, KeyboardInputManager, FakeActuator, LocalStorageManager)