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The one plus I will give this game is that does not shove ads in your face but this unlock seems to mean that every seven hours you basically get...
I agree with jabbsoft about the gameplay and style but... there seems to be a coin wall not all that far in and then the armory upgrades start...
I'm not the developer so I don't know. If I wasn't supposed to create a thread I apologize. I am just a long time fan of the game.
A long time favorite Mac solitaire game is now on ios. The IAPs are various levels of unlock (including, perhaps my personal favorite in ios...
I also agree with countBasil's suggestions and have one of my own - multiple save slots/profiles.