Android app

Get guessIo on Android

Install the APK to keep your next code-breaking match on your phone.

guessIo
Platform
Android
File type
APK
↓ Download APKPlay in your browser

Before you install

  • Use this page as your source.APK files from other sites can be unsafe.
  • Expect a permission prompt.Android asks you to allow installs from your browser the first time. That is normal for APK files.
  • Android only.The APK installs on Android phones and tablets, not on iPhone or desktop.
Downloading

Your guessIo download

Thanks for installing guessIo. Your browser should start saving the APK now. The steps below take about two minutes.

Starting your download...

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What you need

  • An Android phone or tablet.Android 6.0 or newer.
  • An internet connection.To download the file, and to play.
  • Permission to install from your browser.Android asks once. Step 2 shows where.
Install guide

From download to first match

Step 1

Download the file

  1. The download starts by itself. If it doesn't, tap Download didn't start? Try again above.
  2. If your phone says "This type of file can harm your device", tap Download anyway. Android shows this for every app that doesn't come from the Play Store.
  3. Wait for "Download complete".

Nothing happens? Open this page in Chrome, not inside another app, and check your connection.

Step 2

Allow installs from your browser

Android needs your permission once, for the browser you downloaded with.

Android 8 and newer

  1. Tap Open on the download notice, or open the Files or Downloads app and tap guessIo.apk.
  2. When the phone says it can't install unknown apps from this source, tap Settings.
  3. Turn on Allow from this source.
  4. Press Back to return to the installer.

Android 7 and older

  1. Open Settings, then Security.
  2. Turn on Unknown sources and confirm.
  3. Open guessIo.apk again.

Samsung, Xiaomi, Tecno, Infinix and Oppo word this differently, for example Settings > Apps > Special access > Install unknown apps. The Settings button on the prompt takes you to the right place.

Step 3

Install

  1. Tap Install.
  2. If Google Play Protect says "Blocked" or "App not scanned", tap More details, then Install anyway. This appears because the app isn't distributed through the Play Store.
  3. Tap Open when it finishes. You can also find guessIo in your app drawer.
Step 4

First launch

  1. Tap Continue with Google. Sign-in opens in your phone's browser, then returns you to the game by itself.
  2. Pick your Google account. New players choose a username next, and it can't be changed later.
  3. Tap Allow if you want match and friend notifications. You can change this later in Settings > Apps > guessIo > Notifications.

You may stay signed in after you close the app, until your session expires. Use Log Out on the Profile screen to sign out sooner. Signing in on another device signs this one out.

Step 5

Keep it up to date

  • Most updates install on their own.The app checks when it opens and downloads new versions quietly. They apply on a menu screen, or the next time you open the app if you are in a match.
  • Sometimes you need a new file.A banner says a new version is available. Tap Download update, then install the new guessIo.apk the same way. Your account carries over and you don't need to uninstall first.
Stay safe

Keep your phone protected

  • Use this page as your source.Don't install copies of guessIo.apk from other sites or forwarded files.
  • Switch the permission back off.After installing, you can turn Allow from this source off again in the same settings screen.

Something went wrong?

The download won't start

Open this page in Chrome, not inside another app, and check your connection. Then tap "Download didn't start? Try again" at the top of this page.

"App not installed"

Free up some storage and try again. If you have an older copy of guessIo from another source, uninstall it first.

"There was a problem parsing the package"

The download was cut short. Delete the file and download it again.

The Install button is greyed out

Turn off any screen overlay or screen dimmer app, then try again.

Play Protect keeps blocking it

Tap More details, then Install anyway. If that option is missing, open Play Store, tap your profile icon, then Play Protect, then Settings, and turn off "Scan apps with Play Protect" just for this install. Turn it back on afterwards.

Google sign-in doesn't return to the game

Close the browser tab and open guessIo again. If it still fails, make sure you installed the file from this page.

I don't get notifications

Go to Settings > Apps > guessIo > Notifications and turn them on.