Official League of Legends tournament client (provided by Riot Games); All players must use the current tournament patch version; No unauthorized third-party software, overlays, or macros permitted
Why people argue about this
People often assume that using a custom game mode or overlay is okay as long as it doesn't affect gameplay directly, which leads them into misunderstanding the ban on unauthorized third-party software. In reality, this rule extends to any form of external assistance that could give players an unfair advantage over their opponents, not just visual aids like overlays.
