All bonus missions:
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Go to splintercellessentials. com on your PSP’s Internet connection,
select „PSP User”, and enter „A27200203S” as a code.
Bonus missions:
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At the bonus mission screen, hold Select and press L, R, L, R, L, R.
Repeat the code to unlock the next bonus mission.
The bonus missions are „Paris-Nice”, „Heroin Factory”,
and „Television Free Indonesia”.
Splinter Cell: Chaos Theory reference:
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In 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.