James Clewett won the world Tetris championship in 1999, and this short film catches him near the end of a physics PhD, talking through what the game did to him in between. He describes the pull of it in blunt, specific terms: the way falling blocks turned into a constant background calculation, the hours spent chasing faster clears and higher scores, the sense that the game never let his brain fully switch off. Brady Haran shoots it as a single extended interview, letting Clewett work out on camera how a habit that looks like idle screen time turned into something closer to training, sharpening the same pattern-recognition and quick arithmetic his physics work now depends on. There's no competition footage or expert commentary here, just one champion accounting for an addiction that turned out to be useful, and being honest about how strange that trade-off feels from the inside.