Corn continued to climb on Tuesday as it extended gains to the largest level in 10 months after a report showed that cold and wet weather in the U.S., the world's biggest exporter, curbed planting. Corn for delivery in three months gained 1.4% to $6.69 a bushel on the CBOT, the highest figure for most-active futures since April 1, while it was traded at $6.665 at 12:01 p.m. Singapore time.