Not the worlds best game but like most of these on-line games, a challenge just to say - 'done it'. At http://2048game.com/ Just using the 4 arrow keys you join like numbers -2,4,8,16,32,62.128 etc. and try and score exactly 2048. There are no bells or whistles (not on my machine) to say you have reached, or exceeded 2048, so if you are not watching you can easily go over.