Supercollider. 609 Fourth Ave., between 17th and 18th streets in Park Slope. R train to Prospect Ave. (347) 725–3803. Open Mon.–Thu., 7 am–2 am; Fri., 7 am–4 am; Sat., 8 am–4 am; Sun., 8 am–2 am. Drinks served after 5 pm weekdays, after noon on weekends.