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Just got the 1536 again with the next game and a new Highscore of 79554! :D
First I thought that it would be too easy but maybe it's a good training for beginners learning to handle the 1+2 merging when trying that challenge.
I started playing like this but you can't hold that up for a long time (maybe until you get the 192), so it should only be a tactic for early...
