1. Go into Your MW3 And Start A New Campaign
2. Start The First Mission Then Save & Quit
3. Go To The Dashboard And Find Your MW3 Savegame
4. Move It To Your USB Flash Drive And Plug it into Your PC
5. Open Horizon And Extract Your Savegame to your Desktop
6. Open Up The MW3 Save Editor And Edit Your Progress
7. Once Your Done. Save Your File And Open Horizon
8. Explore Your Device Again And Find Your MW3 Savegame
9. Drag And Drop it Into Horizon On Your Device And go To Contens
10. Right Click The Old Savegame And Replace with the Modded One

Then Your Done. Get it back to Your Console And Enjoy Your Savegame
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How To Mod Spec Ops

1. Get Your Spec Ops Save From Your Xbox to Your Computer
2. Open Horizon And Extract Your Spec Ops Save To Your Desktop
3. Drag And Drop The Spec Ops Save From Your Device To Horizon
4. Go To The Contents Tab And Right Click And Click Replace
5. Replace it with the File i Gave You (save_) And Then Save It

Then Your Done. Get it back to Your Console And Enjoy Your Mods!

Download Link:
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[spoil]1. Extract your Xbox Profile to Your USB
2. Create a Backup Folder on Your Desktop
3. Open Horizon And Extract Your Profile To Your Backup Folder
4. Drag And Drop Your Profile into Horizon And Click Contents
5. Look For The MW3 GPD File And Extract it To Your Desktop
6. Open The Clantag/Gamertag Editor And Edit Your Stuff
7. Save The File And Open Your Profile In Horizon Again
8. Click The Contents Tab and Find The Mw3 GPD
9. Replace The Old GPD With the Modded One And Your Done!

Then Your Done. Get it back to Your Console And Enjoy Your Mods!
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[spoil]How To Mod Split Screen
1. Go To Splitscreen/System Link And Kill Yourself
2. Quit The Game And Then Go To the Dashboard
3. Go To Your Hardrive And Find The MW3 Game
4. Hit "A" And Select The Multiplayer Progress Data Save
5. Move To Your USB Flash Drive And Plug ur USB into Your PC
6. Open Horizon And Load Your Flash Drive
7. Click on The GAMES Folder And THen Click on The MW3 Folder
8. Drag And Drop Your MW3 MP Data Save Into Horizon
9. Click On The COTENTS Button And Right Click The MW3 Data Save
10. Click The EXTRACT Button And Save it To Your Desktop
11. Open The MW3 MP Data Editor And Open Your MP Data Save
12. Edit/Mod Your Level, Prestige, Time Played And Classes
13. Save The File And Reopen Horzion
14. Right Click on Your OLD MP Data Save And Click Replace
15. Replace it With Your Modded/Edited MP Data Save
16. Click Save, Rehash And Resign Then Remove Your USB
17. Plug it Into Your Xbox 360 And Load Modern Warfare 3
18. Once its Loaded Go To Spliscreen/System Link
19. Play Around With Your Modded Weapons ETC
20. Your Done! You Have Successfully Modded Your Save!
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To edit GPD : multiupload.com/5OBQ9KXRV8

1) You need to know how to open your GPD of your profile of MW3
2) You need to search the online part in your GPD ( I wont explain you !!! )
3) Save ans go online

You need to put this in the GPD :

set g_compassShowEnemies "1" // Shows Enemies on Radar always
set r_znear "35" //Things closer than this aren't drawn.
set cg_drawFPS "1" //FPS in the upper right hand corner
set g_speed "900" // Speed and Movement Increased
set phys_gravity "99" //Bodys and glass float
set compassSize "1.5" // Bigger radar
set aim_autoAimRangeScale "999"
seta scr_dom_score_kill "9999"
seta scr_tdm_score_kill "9999"


This is tested and work


PS: You can get ban to use this so i am not resposable !

1.Plug a USB flashdrive into your Xbox 360

2.Move your Modern Warfare 3 Single Player gamesave to your Flashdrive

3.Unplug your flashdrive and plug it into your computer

4.Open Horizon 360

5.On the right side of Horizon, click Device Explorer

6.Then click the folder called Games

7.Right click Modern Warfare 3 and extract it to your Desktop

8.Now open the MW2 CVAR Tool

9.Click Load SAVEGAME.SVG and find that file on your Desktop

10.Then add your own DVARs, for example, in the bottom left box, type in g_knockback and in the box directly to the right, type 999999

11.Once you are done adding the DVARs' hit save and choose where you want to save it. (I recommend saving it somewhere else besides your desktop so you don't lose your non-modded saved game if you care about it) NAME IT savegame.svg OR IT MAY NOT WORK!

12.Open Kill_Seth's Checksum Fixer and click open file

13.Open your savegame that you just got done saving in the CVAR tool

14.Click save file and it should say Checksum Fixed!

15.Then go back to Horizon and drag and drop your Saved game into Horizon

16.Click Rehash and Resign

17.Then click Save to Device and click your Flashdrive

18.It will ask you, Modern Warfare 3 Save Game already exists on the designation device. Would you like to overwrite it?. Click yes

19.Now you are done! To use the mods plug the flashdrive back in your Xbox 360

20.Move the Saved Game back to your HDD

21.Start MW3 and play Campaign. Your done!


The following steps only apply to having mods on Spec Ops!
1.After going to Campaign, once the mission starts end the game

2.Go to Spec Ops and you should have the mods