This game is pretty cool, and you can decide to pay for some cards or no, both choices are valid ;). If you want something to play for a weekend, it's probably not for you, if you can login 3 times a day, and are looking for entertainment for a couple of months this may be a thing for you. Rate of progress is really slow, so if you're a completionist there is no chance you will finish all the missions that are there in less then 6 months, even if you decide to pay some money into the game.
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