Splinter Cell Essentials - Platform: Sony PSP

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.