Tsurudontan Roppongi serves fusion udon such as curry udon and mentaiko cream udon on the seventh floor of a building in front of Roppongi Station. Diners choose between thick and thin noodles and can add up to three extra portions of noodles at no charge. On a Saturday at 2:30 p.m., 26 parties waited 50 minutes, while on a weekday around 5 p.m. there was a case of entering with no wait. Noodle thickness and vegetables are selected on a tablet, which makes ordering complicated.