Einstein's riddle

Name: Einstein's riddle
Availability: InStock
Author: Aleksandr Melnikov

v2.9.2 · 5 MB · code 30

f17f55a67a629fa523af757589fa24b7 TRUSTED

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Solve this to start the download.

UpdatedMar 24, 2026

PublishedOct 24, 2022

Packageru.nika.development.einsteinsriddle

Versionv2.9.2 (30)

Size5 MB

MD5f17f55a67a629fa523af757589fa24b7

Min SDK23

Malware scanTRUSTED

Signature SHA1C7:09:FD:74:88:80:56:0D:3D:D8:F9:11:76:13:46:9B:04:3C:A1:CE

SignerCN=Aleksandr Melnikov, L=Saint Petersburg, C=RU

Total downloads10,000

This version10,000

DeveloperAleksandr Melnikov

Age ratingEveryone

- Fix white screen bug in select screen.

- Add not condition.

TRUSTED

Takes about 2 minutes. You'll need roughly 5 MB of free storage.

Grab ru.nika.development.einsteinsriddle_30.apk — hit the Download button above (5 MB). If your browser warns about APK files, choose Keep or Download anyway — that warning fires on every APK, not just this one.
Trust your browser to install — on Android 8+ go to Settings → Apps → Special access → Install unknown apps, pick the app you downloaded with (Chrome, Firefox, Files, etc.), and flip Allow from this source. On older Android, toggle Unknown sources under Security.
(Optional) Verify the file — compute the MD5 of the downloaded APK and make sure it matches f17f55a67a629fa5…. Any difference means the file is corrupted or tampered — delete and re-download.
Open the APK — tap the download notification, or find ru.nika.development.einsteinsriddle_30.apk in your Files app under Downloads, then tap it. Android's package installer will appear.
Check the signer — the install screen will name the publisher. For this build it should read CN=Aleksandr Melnikov, L=Saint Petersburg, C=RU. If it doesn't match, cancel — you have the wrong file.
Review permissions & tap Install — scroll the permission list, then confirm. If Play Protect flags it, tap Install anyway (this APK was scanned as TRUSTED).
Done — open Einstein's riddle — tap Open on the install screen, or find the Einstein's riddle icon in your app drawer.

Common install errors for Einstein's riddle

"App not installed" — usually means an older or differently-signed version is already on your device. Uninstall it first, then retry. Your data may be lost unless you back it up.
"Parse error" — the APK is for a newer Android than yours. This version needs Android 6.0 Marshmallow or later. Pick an older build from the versions list below.
"There was a problem parsing the package" — the download was interrupted. Delete the file and re-download over Wi-Fi.