We heard your complain and updated the game: Now you just need to have 3 Stars in all the levels to play for free forever. It’s a bit challenging, but at least you are not compelled to pay. We hope you will be happier and give the game another try (maybe give us a better review?).
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We had a bug when we did the update yesterday. We fixed it and everything should be fine now. Sorry for the inconvenience. Hope you enjoy the game!