TETR.​IO World Series

The 2026 TETR.IO World Series (TWS) is an international tournament series where teams of five, representing their country/region, play in a 5v5 format! TWS runs from October 11th to December 6th and is a collaborative event between the Collegiate Tetris League organizing team and various online modern Tetris tournament organizers.

TWS is run independently by a team of volunteers and is unaffiliated with the TETR.IO team.