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The game will see that your system has no internet, and will not attempt to send any outgoing packets. The only way to prevent this access/reporting/spying attempt by the game is to physically disconnect your internet before launching the game. The game hard crashes before reaching the main menu if you block this internet access attempt with a firewall. The game does not have any online elements, so this is essentially a form of spyware where the game is monitoring and reporting on your playing habits. Enter the Gungeon (and also Wizard of Legend) connects to the internet every time the game is launched.
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