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Subscribe to our newsletter Rory NorrisThis week: Building a large collection of high-end guns in Marathon, which I'm sure to lose when my luck turns.Besides the moment-to-moment shooting, what's the one element that's made Call of Duty the success that it is today? If you ask me, it's the progression.

You level up your account, unlocking new guns as you go, which pulls you into the camo grind, all for you to prestige and do it all over again.

It's a dopamine rush that worms its way deep into your brain.

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I still remember the incredibly obnoxious (but admittedly cool) level-up sounds from the original Modern Warfare trilogy era.Point is, you don't mess with the bones of Call of Duty's finely-tuned progression system.

A slice of advice that I wished 2014's Advanced Warfare would have heeded.

But instead it threw the progression system out of balance ## Editor's Note The gaming community will surely have mixed reactions to this news. Source: [PC Gamer](https://www.pcgamer.com/games/call-of-duty/a-decade-ago-call-of-duty-sidelined-its-iconic-progression-system-to-dabble-in-gacha-instead-and-i-was-glad-id-forgotten/)