Privacy Policy
Effective date: November 11, 2026
Sudokill is a puzzle game for iPhone published by Retrograde Labs LLC ("we", "us"), a United States company. This policy explains what the app and this website collect, why, and what you can do about it. We do not sell your personal information.
What we collect
- Gameplay events. When you play we record events such as opening the app, starting and solving a case, using a hint, and errors. Each event carries a random install ID, your player ID (every player gets one silently, even without signing in with Apple), the app and iOS version, and the country derived from your IP address. We do not store the IP address in the event. Our own code never collects or uses your advertising identifier (IDFA). Google Mobile Ads, which shows our ads, reads it if you allow Apple's tracking prompt (see "Advertising").
- Sign in with Apple (optional). You can play without signing in. If you sign in with Apple, we receive an Apple user ID and your email address, which is often Apple's private relay address. We ask for the email only, not your name. Our server keeps the email on your account so we can keep your progress in the cloud.
- Saved progress. Cases you solved, hint balance and settings, stored on your device and in our cloud database under your player ID, so they can follow you to a new phone.
- Purchases. Optional one-time purchases (hint packs, Remove Ads) are handled by Apple and Superwall. We receive confirmation of what you bought, not your payment details.
- Ads. The free version shows ads through Google AdMob. See "Advertising" below.
- Technical data. Our servers on Cloudflare process your IP address and basic request data to deliver the service and protect it from abuse. Your sign-in session record stores your IP address and device type (user agent), and our abuse limits count requests per IP address.
Why we use it
- To run the game, sync your progress and restore your purchases.
- To understand how the game is played and fix problems (analytics).
- To show ads that fund the free game.
- To keep the service secure and prevent abuse.
Legal bases (EEA, UK and Switzerland)
If you are in the European Economic Area, the UK or Switzerland, we rely on these legal bases:
- Contract, to provide the game you asked for: your player, saved progress, cloud saves, purchases and deleting your account.
- Legitimate interests, in understanding how the game is played, fixing problems, keeping the service secure, answering your emails, and showing ads that are not personalised to fund the free game. You can object at any time. For usage events, turn off "Share usage data" in the app's Settings.
- Consent, for personalised ads and tracking, which Google's consent form and Apple's tracking prompt ask about. You can withdraw it at any time (see "Your choices").
- Legal obligation, where the law requires us to keep or disclose data.
Who processes data for us
| Processor | Purpose | Where |
|---|---|---|
| Apple | Sign in with Apple, App Store purchases | United States |
| Superwall | Purchase screens and purchase records | United States |
| Google AdMob | Advertising | United States |
| Tinybird | Analytics events | EU |
| Cloudflare | Hosting, database and network delivery | Worldwide network, United States company |
These companies process data under their own privacy policies and, where required, agreements with us. Each receives only the data it needs for its job. We may also disclose data if the law requires it, to protect the safety and rights of players or others, or to a company that takes over Sudokill, which would have to keep following this policy.
International transfers
Our providers process data in the United States, the EU and other countries where Cloudflare's network runs. When data about players in the EEA, the UK or Switzerland goes to a country that those places have not recognised as protecting it adequately, we rely on the safeguards the law provides, such as the EU-US Data Privacy Framework or the European Commission's Standard Contractual Clauses. Email support@sudokill.app for details.
Advertising
In the EU, EEA and UK, Google's consent form asks for your choice before personalised ads. On iPhone, Apple's tracking prompt asks whether the app may track you across other companies' apps and websites. If you allow it, Google Mobile Ads reads your device's advertising identifier (IDFA) to show and measure ads; we never receive it and never put it in our own events. If you decline, ads are not personalised and the identifier is not available. You can change your choice at any time in iOS Settings, and where Google's consent form applies, in the app's Settings.
How long we keep data
- Usage events: deleted automatically 13 months after they happen.
- Account and saved progress: kept until you delete your account. When you delete your account, your account, saved progress, hints and purchase records are deleted at once. Usage events we already sent keep a random player ID that no longer belongs to any account, and they expire within 13 months.
- Sign-in session records (including the IP address and user agent): deleted 30 days after they expire.
- Abuse limit counters (requests per IP): deleted after a day.
- Purchase webhook records: deleted after 90 days.
- Server logs: kept for a short period, normally 30 days or less.
Data travels over encrypted connections, and access to our servers and databases is limited to the people who run Sudokill. No system is perfectly secure, so we can't promise that data will never be reached without permission.
Your choices
- Usage data: turn "Share usage data" off in the app's Settings.
- Ads: change your ad consent in the app's Settings under "Privacy choices" (shown where Google's consent form applies), and the tracking permission in iOS Settings.
- Delete your account: use "Delete account" in the app's Settings. This deletes your account data (see above) and revokes Sign in with Apple for this app.
Your rights
Depending on where you live, you may have the right to:
- see the data we hold about you and get a copy;
- correct it, or have it deleted;
- receive it in a format you can take elsewhere;
- object to, or ask us to limit, how we use it;
- withdraw your consent at any time, without affecting what we did before; and
- not be treated differently for using these rights.
We honour these requests from every player, wherever they live. Email support@sudokill.app and we will reply within one month. If a request is complex, we may need up to two more months, and we will tell you if so. If you signed in with Apple, tell us the email address Apple shares with us (often a private relay address), so we can find your account. If you never signed in with Apple, we can't tell which data is yours, so use "Delete account" in the app's Settings.
US state privacy laws. We do not sell personal information for money. If you allow tracking, Google's use of data to show you personalised ads may count as "sharing" or "targeted advertising" under some US state laws. To opt out, turn off tracking for Sudokill in iOS Settings, under Privacy & Security, then Tracking.
Complaints. If you are in the EEA, you can complain to the data protection authority where you live or work. In the UK, that is the Information Commissioner's Office (ico.org.uk). In Switzerland, it is the Federal Data Protection and Information Commissioner (edoeb.admin.ch). We would like the chance to help first, at support@sudokill.app.
Children
Sudokill is not directed at children under 13, and we do not knowingly collect their personal data. If you think a child has given us data, email support@sudokill.app and we will delete it. In some countries you must be older than 13, up to 16, to agree to personalised ads yourself. If that applies to you, ask a parent or guardian before saying yes.
Changes
We may update this policy. We post the new version here with a new effective date. If a change is important, we will say so on this website before it applies.
Contact
Retrograde Labs LLC
312 W 2nd St Unit #A2299
Casper, Wyoming 82601
United States
support@sudokill.app