Marathon's final Cryo Archive unlock hinges on a 500M robot takedown and a shrinking puzzle grid
Marathon’s final Cryo Archive map unlock requires defeating up to 500 million UESC robots. With ~330.5 million kills so far (about 66% done), progress could speed up as the end nears if kills increasingly count toward the total. A new symbol-matching grid puzzle shrinks as each million robots are eliminated, making the two-part challenge—combat and puzzle—the path to unlocking the Cryo Archive next week rather than this weekend.