All bonus missions:-
Go to splintercellessentials.com on your PSP's Internet connection,
select "PSP User", and enter A27200203S as a code.
Splinter Cell Chaos Theory reference:
On the mission after the graveyard, get to the part where you escape
from your cell. You will hear two men talking about what seems to be
a football player being traded to another league. This same
conversation can be overheard in Splinter Cell Chaos Theory, during
the first mission in single player mode.
Bonus missions:
Hold Select and press L, R, L, R, L, R at the bonus mission screen.
Repeat the code to unlock the next bonus mission. The bonus missions
are "Paris-Nice", "Heroin Factory", and "Television Free Indonesia".
Bonus Mission Codes -
Enter the following at the bonus mission screen (you have to enter the
code each time you want to play the mission):
Unlock:-
Television Free Indonesia mission -
Hold Select and press L+R three times
Heroin Refinery mission -
Hold Select and press L+R three more times
Paris-Nice mission -
Hold Select and press L+R 12 more times.