The following are known Gecko Codes for Call of Duty: Modern Warfare – Reflex Edition on Nintendo Wii (Wii).

Backlot Checkered Load Image [Crashzer]
077FDFE0 00000008
3A003E0E 0001E980
*i46.tinypic.com/ic91k7.png

Red Vision [Crashzer]
0494D0D4 6FFFFFFF

Blue Vision [Crashzer]
0494D0D0 6FFFFFFF
*http://i45.tinypic.com/nn0cxd.png

Lime Vision [Crashzer]
0494D0D0 FFFFFFFF

AC130 [Crashzer]
077FDFE0 00000008
2A9A10F6 000C6140
*Replaces Backlot
*http://i49.tinypic.com/nc0brr.png

Kill House [Crashzer]
077FE04C 00000008
39D06E7E 000B4D00
*Replaces Vacant
*http://i50.tinypic.com/zofgua.png

Jeep Ride [Crashzer]
077FE16C 00000008
39CC0816 000D6A20
*Replaces Pipeline
*http://i47.tinypic.com/o6mude.png

Scout Sniper [Crashzer]
077FE1D8 00000008
39F9F2F6 0009B540
*Replaces Strike
*http://i48.tinypic.com/1zlyt0h.png

Sound Spoofer [Crashzer]
077FE298 00000008
1A5CFC00 00000800
*Game Sounds Robotic

Button Activator (PAL) [Crashzer]
2817D6E0 YYYYZZZZ

Infinite Ammo [Crashzer]
007846E7 0000007F

Force Reload [Crashzer]
2817D6E0 0000ZZZZ
007846E7 00000000
E0000000 80008000
*For lazy people who cant be bothered to shake nunchuck

Unstopable Reloading [Crashzer]
007846E7 00000000
Empty your gun!

Unstopable Reloading [Crashzer]
007846E7 00000000
Empty your gun!

Force Host [hetoan2]
050682A4 00000000

Lagometer Display [hetoan2]
0506D6BC 01B00000

FPS Display [hetoan2]
0506C9CC 01000000

Gravity Modifier [hetoan2]
05080B44 XXXXXXXX

See-through Walls [hetoan2]
05077A6C 60000000

PC Graphics: [BlockBoy]
0507A174 01000000
0507A13C 01000000

Start Game in 1 Second: [BlockBoy]
05067F8C 3F800000

Melee Range Modifier: [BlockBoy]
05074FAC XXXXXXXX
05074FF4 XXXXXXXX
0507503C XXXXXXXX
05075084 XXXXXXXX

Unlimited Sprint: [BlockBoy]
050744B4 01000000

Disable Overhead Names: [BlockBoy]
0506F4D4 00000000

No Damage From Falling: [BlockBoy]
0507377C 69045951

The Maximum Hieght a player can jump: [BlockBoy]
2817FE0A 00008000
05075744 XXXXXXXX
E0000000 80008000

Jump and Hurt Yourself: [BlockBoy]
0507377C 24E69595

Exit Scope on Damage [superman]
05073E3C 01000000

Hold breath forever [superman]
05073BFC 44160000
05073C44 33D6BF95

Universal Codes (any/all regions)

Checkered Map In lobby [Crashzer]
F6000001 8100817F
810761E8 8068D00C
14000010 80EA0AB9
E0000000 80008000
*http://i49.tinypic.com/5wwmt.png
*This code will cause a freeze if you start the game with it activated

Campaign Codes

No Clip [Bully@Wiiplaza]
2817FE0A 7FFF8000
F6000001 80108100
8003B854 2C000000
2817FE0A FEFF0100
14000000 38000001
CC000000 00000000
14000000 8003B854
E0000000 80008000
*Press Home on Main Menu to activate code*
*Press 1 to toggle ON/OFF*

God Mode [Bully@Wiiplaza]
2817FE0A 7FFF8000
F6000001 80008100
80180190 2C000000
F4000000 022C0002
38000001 9818017F
80180190 00000000
E0000000 80008000
*Press Home on Main Menu to activate code*
*Total Invincibility*

Infinite Ammo [Bully@Wiiplaza]
2817FE0A 7FFF8000
F6000001 80008100
7C9D0214 A8840178
14000010 38000001
14000418 38800000
E0000000 80008000
*Press Home on Main Menu to activate code*
*Infinite Weapon Ammo & Grenades*

All Missions Unlocked [Bully@Wiiplaza]
2817FE0A 7FFF8000
F6000001 81008180
3F800000 3F19999A
140001EC 01000000
E0000000 80008000
*Press Home on Main Menu to activate code*
*Non-permanent*
*Video: http://www.youtube.com/watch?v=vwNyAs25VB8

Multiplayer Codes

Infinite Ammo [Bully@Wiiplaza]
20152BA4 FFFFFFFA
F6000001 80008100
A80301F4 7C040050
14000004 60000000
E0000000 80008000
*Host All-Players*

God Mode [Bully@Wiiplaza]
20152BA4 FFFFFFFA
F6000001 80008100
9003000C 80130150
14000004 38001001
E0000000 80008000
*Host All-Players*
*Total Invincibility*
*Hold a grenade until it explodes to die*

Noclip [Bully@Wiiplaza]
20152BA4 FFFFFFFA
F6000001 80008100
54000290 901E00CC
2817FE0A 7FFF8000
14000008 38000001
CC000000 00000000
14000008 801E17A4
E0000000 80008000
*Host All-Players*
*Press Home to toggle ON/OFF*

No Recoil [Bully@Wiiplaza]
20152BA4 FFFFFFFA
F6000001 80008100
FC013040 4C411382
1400000C 60000000
E0000000 80008000
*Non-Host*
*Credits to WiiOS_Ozelot*