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Tess Colwell/The Gazette
Maggie Silliman, 17, left, and Chris Krauss, 16, students at Sherwood High School, brainstorm ideas with their team for a video game featuring narwhals and unicorns during the Global Game Jam event Friday at the Universities at Shady Grove campus in Rockville. Young developers gather for the event to take part in a 48-hour, nonstop competition to develop a computer game based on the theme "extinction."