Cyberpunk 2077's recent 2.0 update has made some big changes to the game, but it's also added some extras here and there, like a brand new arcade game.
The last update before 2.0 arrived, patch 1.6, added in an arcade game you could play in Cyberpunk 2077 called Roach Race, a simple pixel art game set within The Witcher where you play as Geralt's faithful companion Roach. It was a nice addition to the game, and update 2.0 added in a new arcade game called Trauma Drama too, another side scrolling pixel art game with more of a run and gun slant. But it turns out there's another game that's been added in with 2.0 that wasn't mentioned in the game's patch notes.
As spotted on the game's subreddit, the game in question is called Arasaka Tower 3D, a Doom-like game in which you play as none other than Johnny Silverhand, your constant companion in the main game. You'll probably find it to be a bit familiar, as you're playing as Silverhand during his attack on Arasaka Tower, something you experience first hand during an early flashback.