From GCJ rules:

• The top 1000 scoring participants from Online Round 2 will receive Google T-Shirts.
• The top-scoring 500 contestants from Online Round 2 will be notified by email after the close of the round that they have advanced to Online Round 3.

Good luck everyone!

To my sadness, I took 1011th... Next year, I wanna take part in R3 and get T-shirt.

World Charts made from Google CodeJam Statistics page:

Number of competitors in Round3

Number of competitors in Round3 per competitor in Qualification round #Round3 / #Qual

Number of competitors in Round3 per competitor in Round2 #Round3 / #Round2