Tournament

TETR.IO World Series

Registering

GameTETR.IO

Entry FeeInvite

Region—

Format—

DateSun, Dec 13, 2026 11:00AM GMT

About

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.

Rules

Official TETR.IO World Series Rules

Format Explanation Video is available here!

Participants

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Staff

Callisto Interactive

Admin

Marketplace

Galactic Essentials Beanie

$34.95

Buy

+$5.00Prize Pool

+$29.95Callisto Interactive

Galactic Essentials Tee

$29.95

Buy

+$5.00Prize Pool

+$24.95Callisto Interactive

Galactic Essentials Hat

$29.95

Buy

+$5.00Prize Pool

+$24.95Callisto Interactive

Galactic Essentials Hoodie

$54.95

Buy

+$5.00Prize Pool

+$49.95Callisto Interactive

Prize Pool

$1,572.69Current Total

Stretch Goals1/5 Reached

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!