Defeating Algo
On the last mission, when you have to fight Algo, to kill him quicker aim for the 
muzzle when he fires then move up slightly and fire. This will kill him faster.

Defeating Jong Ho
Equip the .45, then hide behind the crates to the right of the full ammo supply. 
Place your center bead on him and fire. He will eventually die. Do not worry about 
getting a clear shot, as you will see with incoming enemies they will die easily.

Avoiding gun turrets:
Roll all the way and, don't run, when the turrets are shooting at you.

Stay on the right side by the door and wait for the target closest to you to come 
up. Roll behind it and wait until the gun has shot all of the target away; it only 
shoots enough bullets to do that. Then, the target in the middle will come up. 
Quickly roll again behind that one, and wait. Next, run and roll between the guns. 
If you get hurt, there is a medpack on the wall. Run and do a jump kick to the 
scientist. The guns will have destroyed themselves and you will be fine.

Level select:
Select the "Profiles" option at the main menu. Highlight the option for "Jasmine 
Curry" then hold L + R + Y + B. You will be returned to the main menu, and 
a "Levels" option will now appear. Note: You will not be able to save the game 
while this code is enabled. 

Mission 5: Algos Head Quarters:
After you infiltrated his headquarters jet with the jet pack there is a sequence. 
When the game resumes you have to kill some opponents and Luther will tell you 
to put three bombs in the plane. On each side is a ladder. Go up one side then up 
the second ladder and go towards the back. There is a mark on the wall in red to 
plant one of the bombs. Hold Triangle to do so. Go down the two ladders and kill 
the guards that came in. Go to the other side then up the other two ladders. Again, 
there is a mark in red where you need to plant the second bomb. Come out and 
kill the other guards that entered. Go towards the back where you first came in to 
jet in the beginning of the level. Use your Micro-cord gun to latch on to the yellow 
pipe on the ceiling. Go all the way back and to find the third final bomb location. 
Plant it, then watch the intermission sequence. Stay there and take out your 
Sniper Pistol. Snipe the guards that are back by the blue crates. These opponents 
are tougher than the last ones you killed, but its easier to snipe them rather than 
killing them in close range. Then, get back to the door and go in. Kill the guard 
quietly and wait for the enemy to talk to you while you kill the guards that come 
down.