Social gaming player GREE plans to close its OpenFeint social gaming platform on 14 December, giving developers one month to retrieve their game data or migrate to GREE’s own platform.

The OpenFeint website is no longer accepting new registrations and encourages developers to move to GREE’s development platform via the GREE Developer Center.

The company said basic GREE Platform SDK integration takes less than a week, so developers should move their data soon if they want to stick with services provided by GREE.

The GREE Platform will support achievement definitions, screenshots, game descriptions and leaderboards and OpenFeint users will be able to use their existing credentials to access the service.

However, historical data from OpenFeint will not be transferred to GREE’s analytics system, which will also lack OpenFeint’s virtual goods management technology at launch. The OpenFeint SDK will also be unsupported.

Developers who have built iPad apps on OpenFeint won’t be able to transfer their data as a tablet-optimised SDK hasn’t yet been released.

GREE acquired OpenFeint for US$104 million in April 2011.