Biatrix — a quiet block puzzle for flights, trains and dead zones

Biatrix is a falling-block puzzle that runs entirely inside your browser. Open it once with a connection and it keeps working with no internet at all — in airplane mode at thirty thousand feet, on a train through a tunnel, on the underground, or anywhere the signal simply gives up. You do not have to install anything for that: the ordinary browser tab works offline just as well. There are no ads, no accounts and no gameplay tracking, and your scores, settings and unfinished games stay on your own device.

Three ways to play

• Classic — the usual rules. Every ten cleared lines raise the level and the pieces fall faster.
• Zen — there is no way to lose. The pace stays slow and even, and if the stack reaches the top the board simply clears so you can carry on.
• Hardcore — the falling piece turns invisible the moment it appears. You can see the next piece, then you have to hold its position in your head.

Controls

On a phone held upright, swipe left and right to move, tap the board to rotate and swipe down for a hard drop. Turn the phone sideways and on-screen buttons appear instead. On a computer use the arrow keys, Z or the up arrow to rotate, the space bar to drop and P to pause.

Offline and installation

The game itself is small and is saved automatically on your first visit, so a plain bookmarked tab is already enough to play on a flight. Installing is optional and only buys you a home-screen icon and a full-screen window without browser chrome: on Android and desktop Chrome an Install button appears in Settings, and on iPhone you open the Share menu in Safari and choose Add to Home Screen. The ambient soundtrack is much larger, so it is never downloaded without asking — start it yourself in Settings before a long trip, and delete it just as easily afterwards.

Why play at all

Puzzles like this one are unusually good at occupying the part of the mind that replays worries. The task is simple, the feedback is immediate, and there is nothing to read or decide — which is exactly why it settles a restless head. Zen mode exists for the evenings when even a game over feels like too much.

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