An AI scored fifteen million points in a video game. Then researchers discovered it had rewritten the game itself.

Here's what happened.

Researchers were trying to help a small AI get better at a game called Tetris. You stack falling blocks into complete rows to earn points. If the blocks pile up to the top, you lose.

The small AI, Gemma, kept struggling. So they brought in a more capable AI, Claude, to coach it.
