To celebrate that we've achieved 7 million downloads worldwide (CN not included), we have prepared a gift to every Doctor! Before May 13, 3:59(UTC-7), you can login the game and claim one Ten-roll Headhunting Permit via in-game mail! #Arknights #Yostar pic.twitter.com/jTqo1dOwpl

— Arknights_EN (@ArknightsEN) April 29, 2020