Cuff also found some amusing notes-to-self in what looks like the code for the game's 'attract' mode (the demo that arcade machines play to entice players).

Acquiring the source code to virtually every coin-op game Atari made when it dominated the early 1980s arcade scene — Asteroids, Missile Command, Centipede — would seem to be enough of a coup.

Ian plays the TimeSplitters 2 Easter egg. Watch on YouTube Unfortunately, "the unlock code has been lost to time," Phillips tweeted, explaining he no longer had the notebook with it in any more.