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I got 4 x 16s first row, 4 x 8s second row, 4 x 4s 3rd row and 4 x 2s on last row just by pressing up.

Then it says game over.

This is wrong because I should be able to shift left / right and merge those same numbers that are matching in a row.

It seems it is game over if all 16 cells are filled in regardless if a move is still possible.

No, the problem is the it think it's over when you do a move and no numbers can merge. The board may be full, and you may have possibilities but you did a move where no numbers could merge.

Also; this version does not implement the random spawn (10% chance to spawn a 4 instead of a 2)

Still impressive for it's size though.

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