Yes. TETR.IO is free and does not ask you to register or hand over an email address before you can use it.

How long does TETR.IO take?

One quick round, then you can leave. We file it under "A minute" — modern competitive stacking against real opponents.

Does TETR.IO work on a phone?

TETR.IO really wants a mouse and a wide window. It will load on a phone, but the experience is built for desktop.

Mind Benders

TETR.IO

Modern competitive stacking against real opponents

Visit tetr.io More Mind Benders

tetr.io

A minute · Best on desktop

Free, no sign-up · online since 2020

What TETR.IO actually is

A browser stacking game with modern handling, configurable delay settings and multiplayer modes where cleared lines are sent across as garbage to your opponent. Ranked ladders, forty-line sprints and a hundred-player battle royale all run without installing anything.

Why it is worth your time

The input tuning is precise enough that the competitive scene lives here, so you can feel your finesse improving frame by frame instead of guessing.

We built one too

AltF Games

Play polished native browser games with fullscreen controls, related picks, and no downloads.

Open AltF Games

Common questions

Is TETR.IO free?: Yes. TETR.IO is free and does not ask you to register or hand over an email address before you can use it.
How long does TETR.IO take?: One quick round, then you can leave. We file it under "A minute" — modern competitive stacking against real opponents.
Does TETR.IO work on a phone?: TETR.IO really wants a mouse and a wide window. It will load on a phone, but the experience is built for desktop.
What kind of site is TETR.IO?: We list it under Mind Benders — one more round, then bed. definitely. The input tuning is precise enough that the competitive scene lives here, so you can feel your finesse improving frame by frame instead of guessing.

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Mind Benders

TETR.IO

Modern competitive stacking against real opponents

Visit tetr.io More Mind Benders

tetr.io

A minute · Best on desktop

Free, no sign-up · online since 2020

What TETR.IO actually is

Why it is worth your time

The input tuning is precise enough that the competitive scene lives here, so you can feel your finesse improving frame by frame instead of guessing.

We built one too

AltF Games

Play polished native browser games with fullscreen controls, related picks, and no downloads.

Open AltF Games

Common questions

Is TETR.IO free?: Yes. TETR.IO is free and does not ask you to register or hand over an email address before you can use it.
How long does TETR.IO take?: One quick round, then you can leave. We file it under "A minute" — modern competitive stacking against real opponents.
Does TETR.IO work on a phone?: TETR.IO really wants a mouse and a wide window. It will load on a phone, but the experience is built for desktop.
What kind of site is TETR.IO?: We list it under Mind Benders — one more round, then bed. definitely. The input tuning is precise enough that the competitive scene lives here, so you can feel your finesse improving frame by frame instead of guessing.