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

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*