How to play:
As before, use the keyboard arrow keys or touch and swipe up,
down, left or right to move the tiles. All the tiles move as far as they can in the chosen direction.
When two tiles with the same number touch, they merge into one which is double the number. The aim
is to create a 2048 tile. The game ends when the board is full and no other moves are possible.
This original 4 x 4 board is widely available online and there are iOS and Android apps.