Firmness prevailed on the local grain market on Tuesday as almost all commodities sustained overnight levels in the process of slow trading activity, dealer said. On the grams side, grams 50x50 gained Rs 63 to Rs 9687, other items sustained overnight levels, they said. On the seed side, cotton seeds oilcake with bag Sindh new picked up Rs 50 to Rs 2000 and Rs 2050, they said. Prices were unchanged on the rice and cereals sectors, they said.