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If you fill up the screen and make a move that does not make a new space for the next tile it is GG!

Should have pressed down ;)

That isn't how 2048 works.

That's how it works in 2048 bytes, because that doesn't leave a lot of room for possible move checking logic

Which sadly isn't how the original works - The game is lost when there are no remaining valid moves, not when all 16 squares are filled.