One of the silly hidden features of Hacknet was the ability to open your own CD tray with a typed command. The creator said this was a hangover from an unfinished multiplayer mode, whereby players could freak each other out by opening their opponents CD trays. That vision of multiplayer digital trespass sadly did not come to pass, but perhaps this can scratch that cyperpunk itch. Hackmud [official site] is a massively-multiplayer hacking sim and it has just been released. Go put on your best hacker sunglasses and come back to watch the trailer.