The original Call of Duty: Modern Warfare 2 on Xbox 360 uses a **slider bar (Low ↔ High)**, not numbered levels 1–10.
These newer titles **do** use a **1–20 numeric scale**. If you’re on a backward-compatible version via Xbox One/Series, verify which game you’re actually launching—the 2009 original vs. the 2022 remake.
Sensitivity is personal. Experiment until tracking feels natural; consistency > copying a pro’s number.