The Nikkei 225 Index gained 193 points or 0.29 percent on Tuesday to close at 66505 points. Gains were led by Sumitomo Chemical (7.50%), Tokyo Electric Power (6.04%) and Mitsui Chemicals (5.67%). Biggest losers were Furukawa Electric (-4.08%), Fujikura (-3.69%) and Mitsui Engineering & Shipbuilding (-3.07%).