Level Passwords
At the Password option from the Start screen enter the following:

Day 1, London, England
Password - BHGG

Day 3, Paris, France
Password - CLGG
Day 18, Train
Password - DCHJ
Day 20, Turkey
Password - FSHJ
Day 25, India
Password - GKMN

Day 25, Wanted in India
Password - HLSN

Day 40, China
Password - JMBJ
Day 61, San Francisco
Password - KNQN

Day 61, Train to New York
Password - MQGG
Day 61, Wild West
Password - LPGG

Old Foe
Password - NRGG
Ending Sequence
Password - PSGG