Lupin’s Hideout:
Complete the game to unlock the hideout where you can view game information 
and listen to the soundtrack.  

Castle lock:
When you get to the castle level, you will come upon a note which reads: 

012...25
ABC...Z
open 
You will then reach a lock where you must enter the correct code number . To 
enter the code, first put in 14, then 15, 04, 13. 

Train code locations:

Lock 1: In the pocket of the police uniform you find. Just put it on and Lupin will 
pull it out of the pocket. 
Lock 2: Written on a blackboard below the card where you witness Zenigata 
talking to Teresa (behind two guards). 
Lock 3: Two halves of one paper with the code are scattered around before you 
reach the locked door. 
Lock 4: The clues are written in the policeman's diary you find on the floor. The 
answer is 1355, and it never changes. 
Lock 5: The answer is the expiration date on Zenigata's bowl of instant noodles 
found in a passengers compartment. 

Final train puzzle room:
To get the pitcher, you must use the keycard you find in the globe (simple puzzle) 
to unlock the switches. Next pull the green lever, then the blue one, then the red 
one, then push the statues that match the holograms onto them. The pitcher 
should be released.

Thirty-Eight handgun:
Lupin does get his Thirty-Eight handgun from Jigen in the City. Do not to use it to 
fire on policemen, security guards, and civilians or you will instantly get a game 
over. However, once you encounter the Raven Kruez ninjas and stone beasts 
underground, you are free to fire at will.

Defeating Theodore:
When fighting Theodore for the first time, run behind the medium-sized rock so 
that it will block most of his fireballs. Then, have Lupin fire on Theodore in first 
person view. Also watch for the ninjas that spawn constantly and that blindside you 
from time to time.

When fighting Theodore for the second time, you merely need to fire on Theodore 
and run to avoid his fireball attacks. However, only hit him once, as he is immune 
to damage as he rises into the air to attack.

Defeating Ancient Giant Boss:
Fire at his neck in first person view and run around when he strikes the ground 
with his staff that causes fireballs to fall on your position. Note: The fireballs will 
not hit Lupin if he keeps moving.

Goemon:
Goemon's special attack allows him to cut down any objects that fly at him, 
including bullets and the ninja's shurikens. 

Jigen:
Jigen's Magnum is twice as powerful as Lupin's Thirty-Eight and can kill any enemy 
with a few well placed shots.