This post is written from an entertainment and single-player/modding perspective . It does not condone cheating in public multiplayer lobbies, which violates the game’s terms of service and ruins the experience for others.

Start Call of Duty: Modern Warfare 3 through your preferred launcher (Steam or Battle.net).

While the exact layout can shift depending on the specific version of the game you are playing (such as the classic 2011 release or the 2023 reboot), a standard FLiNG trainer for the Modern Warfare single-player suite typically includes the following: