Privacy Policy

TWRCTRL has no accounts, no ads and no tracking cookies. To keep the game running and to see how it is played, it handles a small amount of data, described below.

Last updated 30 October 2026.

Who is responsible

TWRCTRL is published by TERRN AB, Sweden, which is responsible for the data described here. Questions or requests go to franklin@terrn.se.

Play statistics

When you play a session or a quick scenario on twrctrl.com, the game reports how the session went about once a minute while you are active. Sandbox sessions never report. A report holds:

• a random session number, made new for every browser tab and never saved in your browser,
• the airport, traffic level and, for quick scenarios, how far you got,
• active play time, the number of instructions you gave, how many aircraft landed and took off, and your TWRSCORE (the score shown in the game, and the session's best),
• where the visit came from: the tag on the link you followed, or the name of the website that linked to TWRCTRL (only the site name, never the full address), or "direct",
• your country and region, worked out from your network location by our host when the report arrives,
• a rough device type, such as "Windows" or "Android phone".

Your IP address, the full browser identification string, your city and any lasting identifier are not stored by TWRCTRL, with the statistics or anywhere else (our host keeps its own logs, see below). Because every tab starts a new session, a returning player cannot be recognised. The statistics are kept with no end date, since they cannot be linked to a person.

Why: to understand which airports and features are played, and to improve the game (legitimate interest).

Keeping the game running and protected

Like any website, the server sees your IP address and browser identification string when your browser loads the game. They are used to:

• Sign a short access pass that lets your browser load airport and aircraft data. The pass is tied to your IP address and browser through a one-way code. It is kept only in the open page, lasts at most 8 hours and is not stored on the server.
• Limit requests, so scripts cannot flood or copy the game. The server counts requests per caller in one-minute windows. Each counter is stored under a secret one-way code made from your IP address, never the address itself, holds only a count, and is deleted within about an hour.
• Check for automated traffic. When this check is switched on, your browser runs Cloudflare Turnstile once when the game opens. Cloudflare looks at signals from your browser and network to tell people from bots.

Why: security and preventing abuse (legitimate interest).

Who else handles data

• Vercel hosts the site, runs the server code and stores the statistics and request counters. Vercel also keeps its own server logs. See Vercel's privacy policy.
• Cloudflare runs the automated-traffic check when it is on. See Cloudflare's privacy policy.

Both are based in the United States and may process data there, under their own safeguards for transfers from the EU/EEA. Nothing is sold or shared with anyone else.

What stays in your browser

TWRCTRL sets no cookies. It saves a few settings in your browser's local storage so the game remembers them. They never leave your device:

• your clock display (UTC or local time), typing preference and radar weather toggle,
• which quick scenarios you have finished,
• how long each airport took to load last time, so the loading bar is accurate.

For the open tab only, it also remembers where the visit came from and whether to skip the intro after a reload. Clearing your browser's site data removes all of it.

Your rights

Under the GDPR you can ask for access to, correction of or deletion of your personal data, and you can object to how it is used. Since the statistics hold nothing that identifies you, we usually cannot find data belonging to one person, but write to franklin@terrn.se and we will help where we can. You can also complain to a data protection authority. In Sweden that is IMY, the Swedish Authority for Privacy Protection.

Changes

If what the game collects changes, this page is updated and the date at the top moves.