Sentence:  From the kitchen the guy said, "I write science fiction. Or I'm trying to write. I've been staring at that screen for three days. You just interrupted a one-hour <WSD>Tetris</WSD> marathon. I need to talk to a real human being." 
Meaning of the word marked with <WSD> tags:  A puzzle video game in which falling tetrominoes must be manipulated to form complete lines, which are then cleared from the grid.