Javier Cañadilla
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Privacy policy

I make games to be played, not to collect data. This policy applies to every game I publish and explains what each one stores, where it is stored and what you can do about it.

Last updated: 28.10.2026 / Javier Cañadilla / Leer en español

  • Your game stays on your phone

    Progress and settings are stored on the device, not on a server.

  • Ads only when you ask

    No sign-up and no selling of data. If a game has ads, they are videos you choose to watch for a reward.

  • Analytics only if you agree

    If a game measures how it is played, it asks you first.

01

Who is responsible

The games are developed and published by Javier Cañadilla Casco, an independent developer. I am the controller of the data described here, and you can write to me at javier@javiercanadilla.com about any privacy matter.

02

Which games it covers

This policy covers all my games published on Google Play and on this website. Most of it is the same for all of them; what changes from one game to another is listed here:

  • Nubo Stores progress on the device. If you agree, it sends anonymous statistics to Aptabase (see section 05). It has an optional purchase through Google Play (see section 06) and, if you use Google Play Games, achievements and records in the cloud (see section 08). It has no ads.
  • Shadow Maze Stores progress on the device. If you agree, it sends anonymous gameplay statistics to Unity Analytics (see section 05).
  • Mewline Stores progress on the device and, if you use Google Play Games, a copy of your game in the cloud (see section 08). It has optional purchases through Google Play (see section 06) and Google AdMob video ads that only appear when you ask for one to get a hint (see section 07). It sends no usage statistics.

When I publish a new game, I will add it to this list before it launches.

03

What my games don't do

  • They don't ask you to create an account. Signing in to Google Play Games is optional.
  • They don't ask for your name, email, phone number or date of birth.
  • They don't access your location, contacts, photos, camera or microphone.
  • They don't show ads you haven't asked for: no banners, and no full-screen ads when the game opens or between levels. The only ads are the Mewline videos you choose to watch in exchange for a hint.
  • They don't sell or hand over data to third parties for commercial purposes.
  • They don't receive your payment details.
04

Data stored on your device

So you can pick up where you left off, each game stores in the app's own storage:

  • Progress Completed levels, stars and the game in progress.
  • Settings Volume, vibration, language and accessibility options.
  • Purchases Whether you have unlocked content, so you are never charged twice, and the hints you have left.
  • Ads In Mewline, how many videos you have watched today, to apply the daily limit.

This data does not leave your device, except for the Google Play Games copy explained in section 08, and I have no access to it. It is deleted when you uninstall the game or clear the app's data from Android settings.

05

Gameplay statistics (only with your consent)

Some games can send statistics to help me understand which levels are too hard or where people get stuck. Today Nubo and Shadow Maze do so, and only after you accept it in the notice shown the first time you open them. If you don't accept, nothing is sent. These statistics are not used for advertising, and are neither sold nor shared.

Nubo

Nubo uses statistics only to improve the game: to see which levels are hardest, tune the difficulty and the tutorial, and know whether players reach the purchase offer. You can change your answer at any time in Settings › Privacy. If you turn them off, any events not yet sent are deleted too.

They are received by Aptabase, a cookie-free, identifier-free analytics service with servers in the European Union, acting as data processor. The following data is sent:

  • Game Game start, region completed and tutorial finished.
  • Levels Level opened, won or abandoned, with stars, moves, restarts, undos, hints and time.
  • Purchase Purchase offer seen, purchase started and its result, and purchase restores.
  • Technical context Game version, device language, operating system and its version, and phone model.

Your name, account, email, advertising ID or any device identifier are not sent. Each session has a random number that changes after an hour without playing, so a player cannot be followed from one day to the next. On its server, Aptabase uses the IP address to infer the approximate country and region and, together with a key discarded every 24 hours, to count distinct players per day. The IP is not stored in the statistics. Aptabase processes this data under its privacy policy.

Shadow Maze

Shadow Maze uses Unity Analytics, a service from Unity Technologies. It sends events such as the start and end of a level, the number of attempts, the stars earned, play time and daily challenges. Unity adds technical data such as the device model, operating system version, game version, approximate country and a random installation identifier. That identifier is not linked to your name or your Google account. Unity processes this data under its game player privacy policy.

If a future game adds statistics, it will also ask for your permission and I will say so in section 02.

06

In-app purchases

Purchases are optional: you can play without buying anything. Examples are unlocking Nubo's paid worlds, or Mewline's packs of hints, cats and yarn colours. They are made through Google Play's billing system. Google handles the payment and your bank details; I never receive them.

To give you access to what you bought, the game receives from Google Play the product identifier, the order number and a purchase token, and stores on the device what it needs to remember the purchase and restore it. In Mewline, if you use Google Play Games, the list of what you bought also travels in the cloud copy, so you can get it back on another phone. If purchases are ever verified with a server of my own, only that purchase token and the product will be sent, for the sole purpose of checking that the purchase is valid. Payment is governed by Google's privacy policy.

07

Rewarded ads (Mewline)

Mewline is the only one of my games with ads, and only of one kind: a video that you decide to watch in exchange for a hint. An ad never appears without you asking for it. There are no banners, and no full-screen ads when the game opens, when a level ends or between games.

  • The video only starts when you tap the button to watch an ad and get a hint.
  • There are at most 10 videos a day. They are not offered in the daily challenge.
  • If you close the video before it ends, nothing happens: you just don't get the hint.
  • Ads are limited to content suitable for general audiences with parental guidance (Google's PG rating).

The videos are served by Google AdMob, from Google. To show them, measure them and prevent fraud, the AdMob SDK collects on its own the device's advertising ID, the IP address (from which an approximate location is inferred), technical data about the phone and the app, and how you interact with the ad. Google processes this data as a controller, under its privacy policy and its explanation of how it uses data from apps that use its services. In AdMob I only see aggregated reports, such as the number of videos watched and what they earned, with no data that lets me know who you are.

Your consent

In the European Economic Area, the United Kingdom and Switzerland, Google's consent form appears the first time you ask for a video. It doesn't appear when the game opens, so as not to bother anyone who never asks for a video. In it you choose whether you accept personalised ads and the use of your data for that purpose. If you don't accept, Google may show you non-personalised or limited ads. You can change your answer at any time in Settings › Privacy › Ad consent.

Outside those regions, personalisation depends on your account settings in Google's My Ad Center. Anywhere, you can reset or delete the advertising ID from Android settings (Settings › Privacy › Ads, or Settings › Google › Ads, depending on the phone).

08

Google Play and Google Play Games

Like any app on the store, Google Play shows me aggregated statistics, such as the number of installs per country or how often the app crashes, as long as you have allowed Google to share diagnostic data. That information reaches me in summary form and doesn't let me know who you are. Google collects it under its own privacy policy.

Google Play Games (Nubo and Mewline)

Using it is optional. If you are signed in to Google Play Games, Nubo unlocks your achievements and stores in the cloud a saved game with your records: the best results and the stars for each level, so you can recover them on another device. It doesn't include unfinished attempts, settings or purchases.

Mewline stores in the cloud a copy of your game: stars, best times, the daily challenge streak, hints and what you have bought. Settings are not copied; they stay on each phone.

Google stores this data in your account, under Google's privacy policy. Each game only accesses its own. You can delete it from your Play Games profile or from your Google account. The Play Games SDK also collects diagnostic data for Google on its own.

Rating on Google Play

Nubo may show you Google Play's rating card once. Google handles it, and Nubo doesn't receive your review or your rating.

Sharing your result (Mewline)

When you share your daily challenge result, the text and image are sent only to the app you choose in Android's share menu. Mewline doesn't store them or send them to me.

09

App permissions

Depending on the game, these permissions are requested:

  • Vibration For haptic feedback, which you can turn off in the game's settings.
  • Internet and network state For Google Play, Google Play Games, Mewline's videos and, if you agree, the statistics described above. You can play offline.
  • Google Play billing For in-app purchases.
  • Advertising ID Only in Mewline, so AdMob can show the videos you ask for, according to your consent.
10

Legal basis and retention

Purchase data is processed to perform the purchase contract you make through Google Play (art. 6.1.b GDPR). Gameplay statistics are processed only with your consent (art. 6.1.a GDPR), which you can withdraw at any time from the game's settings. In Mewline's ads, the use of your data to personalise them is based on the consent you give in Google's form (art. 6.1.a GDPR), which you can change in the game's settings. Data stored on your device is kept until you delete it. Aptabase keeps Nubo's statistics for up to 5 years. Shadow Maze's are kept for the period Unity sets for its service, and I can ask for them to be deleted. Google keeps AdMob data according to its own retention periods.

11

Children

My games can be played by people of any age. I don't ask for your age or knowingly collect personal data from children. The only game with ads is Mewline, designed for adults: its ads never appear without being asked for and are limited to content suitable for general audiences with parental guidance. If you believe a child has sent me personal data, write to me and I will delete it.

12

Your rights

Under the General Data Protection Regulation (GDPR), you can ask me for access to your data, its rectification or erasure, object to its processing, restrict it or request its portability. Since I don't ask for identifying data, I may need you to tell me the game and the device to find what you want to review or delete. Nubo's statistics carry no identifier, so I cannot link them to you; to stop them being sent, turn them off in Settings › Privacy.

Data from Mewline's ads is held by Google, not by me. You can change your consent in Settings › Privacy › Ad consent, reset the advertising ID in Android and exercise your rights with Google from your Google account.

If you believe I haven't handled your request properly, you can lodge a complaint with the Spanish Data Protection Agency (AEPD) or with the data protection authority of your country.

13

Changes to this policy

If a game starts handling data differently, I will update this page before publishing the version that changes it and update the date at the top. If the change is significant, I will also announce it in the game.

This policy is also available in Spanish. If the two versions differ, the Spanish one prevails.