What is MMR in League of Legends and why is it a hidden mechanic ?

MMR or Matchmaking Rating is a feature in League of Legends that is used to match players who have similar skill levels.

The Best Carry Heroes in Patch 7.34d, by Anomaluna, STRATZ

Battle.net Leagues - Liquipedia - The StarCraft II Encyclopedia

What's wrong with being Normal?. (also, try to be more positive

How many games does it take to get into master tier in League of

LoL Ranking System → All Ranks Explained

What is MMR in League of Legends and why is it a hidden mechanic ?

The “banned” skins in League of Legends competitive play

What is My MMR? ▷ How MMR Works in League of Legends

15 TOP SECRET Rocket League Mechanics

This Can Finally Save Apex Legends

🚨League MMR System EXPOSED - LP Gains/Losses in S13

How does this make any sense???? : r/HuntShowdown

LoL Ranks: The ultimate guide to LoL's ranking system

Rocket League ranks, MMR, and distribution explained