Syphon Filter: Dark Mirror Cheats for PSP

Here are some codes you might find useful. I've beaten the game 2 and 1/2 times (on easy,normal, and I'm working on hard) and the codes have been the same all 3 times
Anyway... Episode 1
Part 3: 9-3-8 for the locker in the lounge area.
Pt. 5: 5-8-4 Freeman's code for the safe in his office (behind the painting) and the hand scanner.
Ep. 3
Pt. 1: 6-9-4 code for the safe, which holds Hidden evidence.
Ep. 4
Pt. 2: 5-4-1 for the health tent
Ep. 5
Pt. 1/2: 4-1-5 for a secret corridor.
Hope it helps!

When you rank up or obtain certain badges in multiplayer you will unlock new weapons. These weapons can only be used in Multiplayer mode only.
Unlock Claymore Mines:
Earn Expert mode Gadget Expertise Badge
Unlock Double Sawn-Offs (Pistol):
Earn Elite mode One-handed skill badge
Unlock EMP Grenades:
Earn Expert mode Explosive Expertise Badge
Unlock EPDD:
Earn Elite mode Hand to Hand Combat Badge
Unlock Laser Mines:
Earn Elite Gadget Expertise Badge
Unlock G-17 and Makarov (Pistols):
Start a new account (R0)
Unlock M16 A2 and Famas (ARs, burst fire):
Start a new account (R0)
Unlock M67 Grenades:
Earn Elite Explosive Expertise Badge
Unlock MDS A3 and Spectre (Full Auto SMGs):
Achieve rank R1
Unlock 33 SC-1 and SG-76 H-Bar (Snipers):
Achieve rank R2
Unlock Shot Defender and SPA-12 (Shotguns):
Achieve rank R3
Unlock MDS-7 and Ripper (SMGs in pistol slot):
Achieve rank T1
Unlock AR-15 and Draugonov (Snipers):
Achieve rank T2
Unlock Trip Bar and Ramat (HMGs/ARs):
Achieve rank T3
Unlock M60 E-3 and Chinese Type-56 (HMGs):
Achieve rank O1
Unlock M16K and Galil (ARs, Full Auto):
Achieve rank O2
Unlock Desert Sniper .357 and SP-57 (Pistols):
Achieve rank O3
Unlock USAS-12 and Sawed Off (Shotguns):
Achieve rank 04

Destroy DU containers in Episode 4:
There are 5 DU containers scattered about each level in missions 4-1, 4-2, and 4-3. Shoot each one to unlock weapons for use in Mission mode.
Unlock M1 Super 90 in Mission Mode:
Destroy 5 DU containers in 4-1

Unlock M16A2 in Mission Mode:
Destroy 5 DU containers in 4-2

Unlock M4 Carbine in Mission Mode:
Destroy 5 DU containers in 4-3
Unlock the Rocket Launcher in Mission Mode:
Shoot ALL The Small Warheads in 4-3

Online Badges
Complete the following tasks to unlock the corresponding
Unlock Armor Expertise Badge:
Expert and Elite badges are earned by finding Flak Jackets.
Unlock Ammo Expertise Badge:
Expert - Around 250 Headshots
Elite - around 500 Headshots

Unlock Explosive Expertise Badge (MGL, SMAW or M67):
Expert - Around 200 Exp. Kills
Elite - 500 Exp. Kills

Unlock One Handed Skill Badge (Pistols):
Expert - Around 250 Single Handed Guns
Elite - Around 500 Single Handed Guns
Unlock Gadget Expertise Badge:
Expert and Elite - Get Kills with Laser Mines, Taser and Claymores
Unlock Hand-To-Hand Badge:
Expert - Around 30 Melee kills
Elite - Around 50 Melee Kills
Unlock Triage Badge (Revives):
Expert - Around 100
Elite - Around 200
Unlock Field Medic Badge:
Expert and Elite - Keep on Healing

Unlockables in Training Mode
At the 'Main' menu select Single player and then training mode. Then select the training Level you want.
Unlock SP-57 - Training Mission 1:
Complete the mission in under 1 minute and 25 seconds
Unlock Famas - Training Mission 2:
Complete the mission in under 3 minutes

Unlock UNP .45 - Training Mission 3:
Complete this mission without wasting a shot. Unlock Bonus Missions
Complete the corresponding tasks to unlock 5 different Bonus missions.
Unlock 'Birds of a Feather':
Complete Story mode on Normal or Hard
Unlock 'Jimmy Zhou's Army':
Complete 'Birds of a Feather' mission

Unlock 'Goodnight, Sweetheart':
Beat ALL the time limits in the Training missions

Unlock 'Trapped In The Hornets Nest':
Get ALL patches for 'Combat Sharp Shooter'

Unlock 'Up a Column Without A Paddle':
Obtain ALL patches for 'Elite Weapons Expert'

Unlockables in the Bonus Missions
Unlock M249 SAW:
Beat KemSynth Tower in less than 2:42

Unlock Shot Defender:
Beat Sana Yemen in less than 3:39