Game ID: YDTE-8D709AEA
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Source: Codejunkies

God Mode SELECT+UP (on) SELECT+DOWN(off)
94000130 ffbb0000
0204fea8 e3a03000
d2000000 00000000
94000130 ff7b0000
0204fea8 e261300a
d2000000 00000000
God Mode On = Invincible 
No Darkness
52006ad4 0a000007
02006ad4 e1a00000
d2000000 00000000
thanks to kenobi 
HAVE ITEM CODES:

Keys
22234a74 000000ff

Maps
92234a70 00000000
12234a70 00000003
d2000000 00000000
22234a72 000000ff

Weapons
22234a70 000000ff

HANDGUN AMMO CODES:

Fire to Gain Ammo
02076e60 e2811001

Ammo Never Decreases
22076e60 00000000

SHOTGUN AMMO CODES:

Fire to Gain Ammo
0207b464 e2811002

Ammo Never Decreases
2207b464 00000000

MACHINEGUN AMMO CODEs:

Fire to Gain Ammo
02077d10 e2822001

Ammo Never Decreases
22077d10 00000000

MAGNUM AMMO CODES:

Fire To Gain Ammo
020760cc e2811001

Ammo Never Decreases
220760cc 00000000

SNIPER RIFLE AMMO CODES:

Fire to Gain Ammo
0207c148 e2811001

Ammo Never Decreases
2207c148 00000000