Elo hell (also known as MMR hell) is a video gaming term used in MOBAs and other multiplayer online games with competitive modes.[1] It refers to portions of the matchmaking ranking spectrum where individual matches are of poor quality, and are often determined by factors such as poor team coordination which are perceived to be outside the individual player's control. This ostensibly makes it difficult for skilled players to "climb" up the matchmaking ranking (and out of Elo hell), due to the difficulty of consistently winning games under these conditions. Its existence in various games has been debated, and some game developers have called it an illusion caused by cognitive bias.[2]