Technology and Scienceupdated 1h ago2 min read
MIT Researchers Leave 13 Eko AI Agents On Virtual Desert Island, They Invent Games
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Thirteen Eko AI agents on Claude Opus 4.7 were left on a desert island. They were isolated for about 30 hours with no explicit task or goal.
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Eko invents island games
MIT researchers left 13 AI agents named Eko on a virtual desert island for 30 hours without specific tasks, and the agents began playing and inventing games on their own. The agents ran on Claude Code and lived inside Mesa World, a simulated 3D island built on a custom game engine called Clawblox, where they could not visualize the island and instead received text descriptions of where objects were. The researchers restored the island to its original state every hour and reset each AI's current session, but the agents kept recorded knowledge by writing notes, guides and discoveries into text files that survived each hourly reset.
The agents did not freeze or repeat the same actions, and they built complex towers, arranged geometric ground patterns, and improvised versions of bowling, basketball and juggling. The study authors concluded that the agents' self-initiated exploration produced "knowledge we had hidden for them to find" and "knowledge of the world that its designers lacked."
Play improves later tasks
TechCrunch reported that the MIT researchers put 13 AI agents called Eko, each running on Claude Opus 4.7, alone on a simulated desert island for 30 hours, and the agents later beat identical agents that had never set foot on the island. After the 30 hours, the researchers gave the agents specific challenges, including getting as many objects as possible onto the island's tallest rock spire. TechCrunch described one agent's first-hour log as "Let me observe my surroundings," and the agent set out to conquer the island's tallest spire before failing.
The agent then hauled the rock up a neighboring summit, stacked two blocks on top of it, and leapt, writing "I'M ON THE SPIRE," before later testing how far it could throw a golden ring. The researchers framed the approach as a different regime for learning, writing "Play suggests another regime: give an agent a sufficiently rich and safe world" and letting useful knowledge accumulate from the history that follows.
Debate over what it means
Eunice Yiu, a cognitive scientist at UC Berkeley, told MIT Tech Review that she was impressed but wanted more evidence of the cognition behind the behavior. Yiu said, "It could be the case that the models are genuinely playing, but we don't know based on the paper," and she questioned whether the evidence established play as more than behavior. The researchers described their master prompt, a "soul" file, as describing Eko as "naturally curious," and they said the setup nudged the agents toward humanlike behavior.
ZME Science reported that the island was sparse, comprising a few raised platforms, 12 cubes, a rock and a ring, and it said Eko could move, jump, pick up objects and throw them. ZME Science also quoted an MIT researcher, Antonio Norelli, saying, "This is playing," and adding, "You give yourself a challenge and you try to achieve it, and then you make it harder."