Privacy Policy
ZENO: The Last Monarch · elfailab · Last updated 14 November 2026
ZENO is a free browser game. We collect as little as we can, and nothing that names you unless you type it yourself. This page explains what is stored, where, and why.
1. Stored only in your browser
- Your save: story progress, levels and upgrades, achievements, best scores and settings (language, volume, quality…).
- A random player id and the leaderboard name you chose, so your scores stay yours.
- The last few error reports, kept locally to help with bug reports.
The game itself uses your browser's local storage, not cookies. Clearing your browser data, or Settings › Reset progress, deletes it. Ads use cookies (see section 4).
2. Sent to our server (only when you use online features)
| What | When | Why |
|---|---|---|
| Random player id + the name you chose | You save a leaderboard name | Show your name on leaderboards |
| Score, wave, kills, run length, game version, date, board | You end a run on Hard | Leaderboards and the Daily Challenge |
| The text you write | You use Send feedback | Fix bugs and improve the game |
| Error message, technical stack trace, game state (mode, zone, chapter), browser type, game version | The game crashes | Find and fix crashes |
| Anonymous gameplay events: chapter and stage reached or finished, falls, leaving a stage, Free Play wave, session length, phone or computer, language, game version — with a random session id and your random player id | While you play | See where the game is too hard or unclear, and fix it |
Gameplay events contain no name and no IP address. If your browser sends Do Not Track or Global Privacy Control, none are sent.
IP addresses are never stored. We keep only a salted, one-way hash of it for a short time to limit spam and abuse (for example, how many scores one connection posts per day).
Leaderboard names and scores are public. Don't use your real name or anything personal as your leaderboard name.
3. Who processes it
The game and its database are hosted by Cloudflare (Cloudflare Pages and D1, primary location in Western Europe), acting as our processor. We do not sell or share your data with anyone else.
4. Advertising (Google AdSense)
ZENO is free and paid for by ads served by Google AdSense: an optional ad you choose to watch for a reward (rising again after a fall, double XP, a Free Play pass), and at most a short break between chapters. Ads never sell power.
Google and its partners use cookies and similar identifiers to show ads, limit how often you see them, measure them and fight fraud. Depending on your choices they may be personalised. In the EU, the UK and Switzerland you are asked first, through Google's certified consent message, and you can change your choice at any time from the Privacy and cookie settings link it shows. Learn how Google uses data from sites that use its services: policies.google.com/technologies/partner-sites, and manage ad personalisation at adssettings.google.com.
We do not give Google your leaderboard name, feedback or player id.
5. How long we keep it
- Leaderboard names and scores: while the leaderboards exist.
- Feedback, crash reports and gameplay events: up to 12 months.
- Rate-limit hashes: they are only compared for 24 hours.
6. Your rights
You can ask to see, correct or delete the data linked to your player id (shown in Settings), or object to its use, under the GDPR and similar laws. Email [email protected], or use Send feedback in the pause menu, and include your player id. You may also complain to your data protection authority.
7. Children
ZENO is a dark-fantasy action game meant for players aged 13 and over. We don't knowingly collect data from younger children.
8. Changes
If this policy changes, the date above changes too; important changes will be shown in the game.
Questions about this policy: [email protected].