All Weapons and Infinite Ammo Highlight the Weapons Menu. Then, simultaneously press and hold Right, R2, L2, Circle, Square, and X. (Thanks to pamwill@ipa.net and msevier@home.com and JCRGRBF@aol.com, alrowla@ibm.net)

Expert Mode At the title screen, hold: Left,+L1+R2+select+Square+Circle+X simultaneously. If entered correctly you should hear, "Damn It". (Thanks to msevier@home.com, alrowla@ibm.net)

Level Select Go to the Options menu and highlight "Select Mission". Simultaneously press and hold R1+L1+Select+X. If done correctly, a menu with levels should appear. (Thanks to pamwill@ipa.net, msevier@home.com, ROBOT2032@aol.com, alrowla@ibm.net)

Movie Theater Pause the game during the Georgia St. level. Then, highlight the map menu and press: Right+L2+R1+X. (Thanks to alrowla@ibm.net)

Kill with Half the Ammo Highlight the Map Menu. Then, simultaneously press and hold Right, R2, L2, and X. You should hear a laugh. (Thanks to pamwill@ipa.net)

Super Ammo for the 9mm Go to the weapons menu and highlight the 9 mm silencer. Then, simultaneously press and hold Right, R2, L2, Circle, Square, and X. You should hear "Understood". (Thanks to pamwill@ipa.net and msevier@home.com)

Weak Enemies Pause the game and highlight the Map option. Then, press and hold: Right+L2+R1+X simultaneously. If you entered the code correctly you should hear a laugh. (Thanks to msevier@home.com, ROBOT2032@aol.com, alrowla@ibm.net)

One Hit Kills Pause game play, highlight the "Silenced 9 mm" selection under the "Weapons" option, then press Left + L 1 + R2 + Select + Square + X. Gabe will say "Understood" to confirm correct code entry. A single shot anywhere on the body of an enemy with any gun will kill instantly. (Thanks to Maxgamer14@aol.com, specialagents@mindspring.com)

Hint: Survive Burning Quickly press Start, then press Start again after catching on fire. You will be hurt but still alive. (Thanks to Maxgamer14@aol.com)

Hint: CDBC Agents Turn Bad When playing the first stage of Syphon Filter, wait for a CBDC agent to be killed. Once the CBDC agent is dead, approach the corpse and shoot it in the head a few times. All the CBDC agents will turn against you. Note: You cannot kill the CBDC agents without destroying the mission. (Thanks to Maxgamer14@aol.com)

Hint: Adolf Hitler Image Move straight ahead in the "Warehouse 76" level after getting to the first checkpoint without getting burned. You will reach a giant metal box with a catwalk over the top of it. Climb onto the box then onto the catwalk and run straight ahead. After reaching the end of the catwalk, hop down onto another giant metal box, kill the guard, and look to the right (or where the guard was running when he saw you). A large painting of Adolph Hitler's face can be seen. (Thanks to Maxgamer14@aol.com)