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5% winers until now :) Or the players are too smart or the game is not too hard ?

If you're looking to add difficulty, it might make sense to remove a horizontal and vertical row and make it 4x4.

5% winers until now

Where do you see that?

Google Analytics - Events.

It's probably real wins, but this? ;)

ga("send", "event", "game", "end", 'game-won', '1000000');

Yes. This :)