You're referring to the MegaTrainer from Call of Duty: Modern Warfare 3!

He peaked the corner, fired two shots—missed. The recoil threw his aim high. He ducked back as a hail of gunfire shredded the barrier he was hiding behind.

: Many sites offering "megatrainers" or "hacks" are fronts for malware. These files often require you to disable your antivirus, leaving your PC vulnerable to keyloggers or ransomware. Single-Player vs. Multiplayer

For clarity, there are two different games with this title: the original Call of Duty: Modern Warfare 3 (2011) and the newer Call of Duty: Modern Warfare III (2023)

Risks You Must Know

Even with Plutonium, there are dangers:

He tabbed back into the game. The world lurched back into motion. Elias stepped out from behind the concrete barrier, walking calmly into the kill zone. Bullets sparked against his chest, pinging off an invisible shield. He didn’t even flinch. He raised his customized MCW, the reticle dead center, and held the trigger down. The gun didn’t kick; it just sprayed a laser-beam line of death across the screen. The Konni soldiers dropped like marionettes with cut strings.