Now that it has officially launched its N-Gage mobile gaming site, Nokia is inviting game fiends to partake in the worldwide Mobile Games Innovation Challenge. Developers are asked to submit concepts for mobile games that would rely on the advanced features of N-Gage-compatible devices and Nokia's Series 40 or S60 devices.

The three most innovative game concepts will get Nokia Publishing pre-production contracts along with some cash to help with the game development. First place gets 40,000 euros ($63,000), second gets 20,000 euros ($31,500) and third place gets 10,000 euros ($15,800).

Nokia's accepting submissions through August 20. Winners will be announced during the Nokia Games Summit in Rome at the end of October. For details, click here.