Leo’s phone screen glowed at 2 a.m. His thumbs swiped past endless "link expired" and "file not found" messages. Thor: The Dark World —the official tie-in game—had been delisted from every app store years ago. But Leo was stubborn, and broke. No way was he paying for a used tablet just to play an old movie game.

One thread, posted in 2018, had a single reply: "Still works. But read the README first."

He slammed "Y."

Leo dropped his phone. The game’s title music—a grim orchestral swell—played from his speakers even though they were unplugged.