Mega Man Battle Network 2

Lego Batman: Legacy of the Dark Knight is full of Easter eggs, but one of its most obscure will put a smile on the face of anyone who grew up in the Commodore 64 era of computers. As spotted by the eagle-eyed Cabel Sasser, a quick jaunt to the Batcave during one of the early missions will see Batman use a very vintage computer to input some clues as he tracks down the Red Hood gang. In a brief moment, the CRT screen flashes with some code, which just so happens to work on a Commodore 64 PC. Input that code on a C64 (or an emulator), and you'll get a menu that features the Batman logo bouncing