Every time the player moves, game will spawn new node of value 2 or 4 in any empty space
inside the 4x4 board.
Every 8 move, new node that is spawned will pop up as wild node that can be combined with
any node.
Player will lose if the player cannot move in any of the 4 direction, cannot move means that
anything the player press will not change the state of the board because there are no nodes
that can be combined anymore.
Player will win the game if there is at least one node with value of 512.
