That's pretty much the method I used to solve it. You aim for the right hand corner using only right and down moves. Your goal is to keep the rightmost column f

That's pretty much the method I used to solve it. You aim for the right hand corner using only right and down moves. Your goal is to keep the rightmost column fully merged. This allows you to make the occasional 'Up' move when you need to merge tiles from the third column into the rightmost column. You should not make any 'Up' moves unless you absolutely have no other move. You should not try to merge large tiles from the bottom of the third or second column into the third. Just let them build up on their own and eventually the top of the columns will be able to merge together and you can then merge the rightmost tile and fill it up again. First priority is to keep the rightmost column completely full.