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That I don't know π€·. The video was released about a month ago and as far as I know, level 8300 wasn't on Windows 10 yet. So either it's one of the players that tests the level before release, an employee of King, a genius hacker that like cheat codes or it's a prank (you can't see the actual level, you just see the board). But since you guys are already at level 8300 and it apparently matches the board on the video, we can scratch the latter.