Elden Ring’s new Shadow of the Erdtree expansion requires fast reflexes, a well-equipped character, and plenty of patience if you’re looking to conquer it. Or if you want to show off, you could find a novel way to play it, just like Twitch streamer Perrikaryal has done by using the power of her mind to make progress.

Working her way through the Elden Ring DLC–which is quickly earning a reputation for being incredibly challenging–Perrikaryal has already managed to beat several of the early bosses with pure brain power, like those two guys in a Chinese dragon costume. How does the hands-free setup work? According to Kotaku, Perrikaryal’s rig uses motion sensors to track her head and eye movements alongside an electroencephalogram (EEG) device to record the electrical activity of her brain.

It’s not a perfect system and there are times when the code behind it requires fine-tuning, but when it works, it really works. If you’re interested, you can see more on Perrikaryal’s Twitch channel, where she has several highlights of challenging the tough new bosses. If you’re not quite ready to build your own Cerebro in your quest to be the top Tarnished in Shadow of the Erdtree, you can check out GameSpot’s Elden Ring DLC guides hub for some helpful tips and tricks, or you can check out our rundown of 14 things to know before jumping in.

Shadow of the Erdtree has been a critical success since it launched, scoring a perfect 10 in GameSpot’s review. On GameSpot’s sister site Metacritic, it has become the highest-rated expansion for a role-playing game ever, a feat that was previously held for several years by The Witcher 3’s Blood and Wine DLC.