my crysis2 can play well,but i need open it in my "crysis2.exe".
my origin don't have it.
i try to write CDK in my origin,but it does't work.
because i use the key in my game ,maybe.
so ,how can i make it in my origin?

From the Origin main menu
Origin -> Redeem Product Code

Try entering the code (XXXX-XXXX-XXXX-XXXX-XXXX) both with dashes and without.

Origin will register both DVD and Steam versions of the game, whether they have been "used" already or not. A code that has been previously redeemed with Origin will not work a second time, however.