An internet word game has generated enough rice to feed 50,000 people for one day, the UN's World Food Programme (WFP) has said.
The game, FreeRice, tests the vocabulary of participants. For each click on a correct answer, the website donates money to buy 10 grains of rice.
FreeRice went online in early October and has now raised 1bn grains of rice.
That is enough rice to feed 50,000 people for one day, the WFP said on Friday.
The head of the WFP, Josette Sheeran, said: "FreeRice really hits home how the web can be harnessed to raise awareness and funds for he world's number one emergency."
She said word of the game has spread with the help of internet bloggers and websites like Facebook and YouTube.
"FreeRice really hits home how the Web can be harnessed to raise awareness and funds for the world's number one emergency," she said.
"The site is a viral marketing success story."
FreeRice is the invention of US online fundraising pioneer John Breen.