Marathon players must blast through 500 million UESC robots to unlock the Cryo Archive map, and it may not take as long as you'd think
Players of Marathon must collectively defeat 500 million UESC robots to unlock the game's final map, the Cryo Archive. While the kill count is progressing steadily, there are theories that progress may accelerate as the target nears. This objective is tied to a symbol-matching mini-game that shrinks in size with every million robots eliminated.
Eurogamer
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