In-app purchase!

what is meaning ’ in app purchase ’ when i tried to buy aoeDE ?
please explain to me because i want to buy it but i am afraid there will be some unlocked features that i can not access without paying extra money! and if so, what is the unlocked features ?
and what is " beta " version ?
Thanks in advance !

You can buy the soundtrack. That’s about it :slight_smile:

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Do u mean additional soundtrack ? Not the default one?
Of course i will not buy a mute game !

Yes, it is additional soundtrack. Game is by default not muted.

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Thank you guys very much …