Einstein's riddle v2.9.1
APK · 5 MB · version code 29 · Android 6.0+ · uploaded Nov 15, 2025
- Signature matches the Google Play version Details
Quick check before downloading
Answer this to unlock the download. It keeps automated downloaders away.
Compared with the latest version
The latest version is v2.9.5, uploaded Sep 25, 2026 — about 10 months after this one.
- Size: this file is 5 MB; the latest is 5 MB (56.9 KB smaller).
- Android: this version needs Android 6.0+; the latest needs Android 7.0+. Use this one if your device runs an older Android release.
- Both versions request the same permissions.
File information
- Version
- v2.9.1 (29)
- Uploaded
- Nov 15, 2025
- Size
- 5 MB
- Requires
- Android 6.0+ (API 23)
- CPU support
- Any (no native code)
- Screen
- Small screens and larger
- MD5
- 4d54cf6a5bc4d4ae6b1eb54dd020b818
- Signing certificate (SHA-1)
- C7:09:FD:74:88:80:56:0D:3D:D8:F9:11:76:13:46:9B:04:3C:A1:CE
- Signed by
- CN=Aleksandr Melnikov, L=Saint Petersburg, C=RU
- File name
- ru-nika-development-einsteinsriddle-29-72335442-4d54cf6a5bc4d4ae6b1eb54dd020b818.apk
- Package
- ru.nika.development.einsteinsriddle
- Downloads (all versions)
- 10K+
- Age rating
- PEGI 12 · Low Maturity
What's new in v2.9.1
Problem when top bar is overlapping with game screen was fixed.
Permissions (1)
This version requests 1 permission, none of them sensitive.
- Internal broadcast protection (app-defined) ru.nika.development.einsteinsriddle.DYNAMIC_RECEIVER_NOT_EXPORTED_PERMISSION
Security & authenticity
Security rating: Trusted
Signing certificate
- Signature matches the Google Play version Checked by the source store on Nov 15, 2025.
- Certificate issued to “Aleksandr Melnikov” This is the certificate of the Google Play version.
- Same certificate as the 2 other versions checked
Store checks
- Developer signature verified Nov 15, 2025
- Validated against Google Play Nov 15, 2025
- Uploaded by “appupdater” Gold tier · 117,810 followers · uploading since 2020
Scans come from the source store; the certificate comparisons are AAPKs's own, made from the files' published signatures (2 other versions compared). AAPKs doesn't scan files itself.
How to install Einstein's riddle on Android 6.0+
You'll need about 10 MB of free space.
- Download the APK — tap Download APK above (5 MB). Chrome shows “File might be harmful” for every APK file; choose Download anyway only if you trust this file.
- Open the file — tap the download notification, or open Files › Downloads and tap ru-nika-development-einsteinsriddle-29-72335442-4d54cf6a5bc4d4ae6b1eb54dd020b818.apk.
- Allow the install (first time only) — Android 8 and later asks for permission the first time an app opens an APK: tap Settings in the prompt, turn on Allow from this source, then go back. Manual path: Settings › Apps › Special app access › Install unknown apps (on Samsung: Settings › Apps › ⋮ › Special access). On Android 7 and older: Settings › Security › Unknown sources.
- Check the file (optional) — the MD5 of the downloaded file should be 4d54cf6a5bc4d4ae6b1eb54dd020b818. If it differs, the file is damaged or was changed: delete it and download again.
- Tap Install — Android asks “Do you want to install this app?”. If Google Play Protect shows a warning, read it before you continue: the source store rated this file Trusted, but only install apps from sources you trust. If an earlier version is installed, this one only installs as an update when it is signed with the same certificate (SHA-1 shown above).
- Open Einstein's riddle — tap Open on the install screen, or find it in your app drawer.
Common install problems
- “App not installed” — a version signed with a different certificate, or a newer version, is already installed (Android doesn't allow downgrades). Uninstall it first; back up your data, because uninstalling deletes it.
- “There was a problem parsing the package” — the file is incomplete, or your Android is too old (this version needs Android 6.0+). Download it again, or pick an older version.
- Blocked by Play Protect — Play Protect checks apps from outside the Play Store. Only continue if you trust the source.