GameSpot may receive revenue from affiliate and advertising partnerships for sharing this content and from purchases through links. Early into Call of Duty: Black Ops 6's campaign, you will be taken to your safehouse, where you can buy upgrades to gear up for missions. As you explore this mansion you may notice some places with interactable items and a locked safe in a second-floor bedroom requiring a four-digit code. To get that code you will need to complete a series of puzzles, and since the code is different for each player, you're gonna need to go through all of the steps, which we have covered below.