🧩 Privacy Policy

Ludere (iOS & Android) and PuzzleHub (Windows, macOS, Linux)

Last updated: 23 July 2026

The short version

No accounts. There is nothing to sign up for and no password to forget.
No ads, no analytics, no tracking. The apps contain no advertising or analytics software of any kind, and nothing you do is profiled or sold.
Single-player stays on your device. Play offline and nothing leaves it.
Online play sends only what a game needs — the display name you chose, the moves you make, and any chat you type — over an encrypted connection.
Our server forgets. It passes messages between players and keeps them in memory only. There is no database, and chat is never stored or read.

Who this covers

This policy applies to the mobile app Ludere (Google Play and the Apple App Store) and the desktop app PuzzleHub (downloaded from digdyn.com). Both are the same collection of puzzle, board and card games, and both are published by DigDyn ("we", "us").

Where the platforms differ, this policy says so explicitly.

What we do not collect

To be direct about the things people usually worry about, none of these are collected, requested, or accessed by the apps:

Names, email addresses, phone numbers, or postal addresses
Location data of any kind
Contacts, photos, camera, microphone, or files on your device
Advertising identifiers, device fingerprints, or persistent tracking IDs
Payment information — the apps contain no purchases or subscriptions

The Android app requests exactly one permission, INTERNET, and only so that online multiplayer can connect. The apps include no advertising SDK, no analytics SDK, and no third-party software that collects data about you.

What stays on your device

The apps save a few small files locally so your settings and progress survive a restart. These never leave your device, and we cannot see them:

The display name you type for online play (hub_prefs.dat)
Per-game statistics and preferences — wins, losses, best times, difficulty settings (*_stats.dat, *_online_prefs.dat)

On Android and iOS these live in the app's own private storage and are removed automatically when you uninstall the app. On desktop they live in your user profile (~/Library/Application Support/Puzzles/ on macOS, ~/.local/share/Puzzles/ on Linux, or beside the program on Windows) and can be deleted at any time.

What is sent when you play online

Most games can be played entirely offline against the computer, and in that case nothing is transmitted at all. If you choose to host or join an online game, or open the lobby, the app connects to our relay server at games.digdyn.com and sends:

Display name	The name you typed. It defaults to "Player" and it is not verified, not linked to you, and can be changed or made up at any time.
Game session	Which game you are playing, the room code, and your seat number — so players in the same room reach each other.
Moves	Your plays and the resulting game state, so the other players can see them.
Chat	Any message you type into an in-game or lobby chat box.
IP address	Your device's network address and the time it connected. Every internet connection reveals this; it is not something the app chooses to send, and we do not use it to identify you.

All of it travels over an encrypted (TLS) WebSocket connection. Before connecting, the app also makes a single health-check request to the same server to wake it, which sends nothing beyond the request itself.

Please treat chat as public. Anything you type in a chat box is delivered to the other people in that room. Do not share personal information — an address, a phone number, anything you would not tell a stranger — with players you do not know.

What our server does with it

The relay is deliberately simple: it forwards messages between the players in a room and nothing more. Specifically:

There is no database. Rooms, seats, display names and lobby presence are held in memory while a session is active and are discarded when the room empties or the server restarts.
Chat and game messages are never inspected or stored. The server does not look inside them; it passes them along and forgets them.
Operational logs record connection events — a timestamp, an IP address, a display name, a room being created or closed — so that we can fix faults and stop abuse. They do not contain chat content or game moves. They rotate automatically at a fixed size and are kept no longer than needed for that purpose.
Connection limits count recent connections per IP address, in memory, to keep one source from overwhelming the server.

The website and desktop downloads

This section applies to digdyn.com and the desktop app only. The mobile apps do none of it.

Downloading PuzzleHub from our download page records one line — time, IP address, platform, version, file, browser user-agent and referring page — so we can tell how many people downloaded which build.
When the desktop app updates itself, it reports one line — time, IP address, platform, and the versions upgraded from and to — for the same reason.

These logs are not public, are capped in size, and are not linked to anything else. The mobile apps have no self-update mechanism; they are updated through Google Play and the App Store, which have their own privacy policies covering that.

Who we share data with

We do not sell your data, share it with advertisers or data brokers, or use it for advertising or profiling. There are no third-party trackers in the apps.

Our server and website are hosted by a hosting provider that necessarily processes this traffic on our behalf in order to run the service. We may disclose information if the law requires it, or where it is genuinely necessary to protect the service or its users from abuse.

If you install through Google Play or the Apple App Store, those companies handle the download, payment (the apps are free) and update process under their own privacy policies. From them we receive only the reporting those stores give every developer — install and uninstall counts, ratings, and crash reports containing a device model, an operating system version and a technical stack trace — never a list of who installed the app.

Children

The apps are suitable for a general audience but are not directed at children under 13, and we do not knowingly collect personal information from children. Some included games simulate casino play — poker, blackjack, bingo — using play money only. There is no real-money gambling, no purchases, and no way to convert anything in the app into money or prizes.

If you believe a child has provided personal information through chat, contact us and we will remove what we can.

Your choices

Play offline. Nearly every game works fully offline against the computer, and offline play sends nothing.
Choose any display name. It is free text, is not verified, and does not have to be your real name.
Delete everything. Uninstalling the app removes the local files on mobile; on desktop you can delete the data folder listed above. Because the server keeps no database, there is no stored account or history for us to delete.
Ask us. If you want to know what we hold about you, or want operational log entries relating to you removed, write to us at the address below.

Security

Online play uses encrypted (TLS) connections. Because there are no accounts, there are no passwords for us to store or lose. No system is perfectly secure, but we keep the amount of information involved as small as we reasonably can — which is the best protection available.

Changes to this policy

If the way the apps handle data changes, this page will be updated and the "last updated" date at the top will change. Material changes will also be reflected in the app's store listings.

Contact

Questions about this policy, or about privacy in the apps, can be sent to privacy@digdyn.com.