TETR.IO World Series
The 2026 TETR.IO World Series (TWS) is an international tournament series where teams of five, representing their country, play in a 5v5 format! TWS runs from October 11th to December 13th and is a collaborative event between the Collegiate Tetris League organizing team and various online modern Tetris tournament organizers.
Click to join the Discord server for sign-ups and additional info!
Format Explanation Video is available here!
NOTE: The 2026 TETR.IO World Series is an independent event organized by Collegiate Tetris League organizing team. Callisto Interactive LLC is not an organizer of this event, and is a limited scope partner administering the fundraising platform.
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Predict the playoff match results! For the week between group stage and playoffs, all TWS viewers can submit a bracket predicting the scores and results of each match in the playoffs. The most accurate bracket receives a month of TETR.IO Supporter!
Payout expands to Top 4 (50/25/15/10)
Payout expands to Top 6 (45/25/14/10/3/3)
Payout expands to Top 8 (40/25/15/8/4/4/2/2)
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