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Sony PSP - Splinter Cell Essentials cheats

Extra missions:
Go to the bonus mission screen, hold Select and press L, R, L, R, L, R. Repeat the 
code to unlock the next extra mission

Getting all bonus missions 
Visit to www.splintercellessentials.com website with your PSP.
On the conection select "PSP User" and type "A27200203S" as a password.