
Dual N-Back: Memory Training
Scientifically designed brain training game to improve working memory and focus
合格アプリ · com.goukaku.nback
At a glance
- Latest version
- v2.18.51 (2018051)
- Updated
- Oct 2, 2026 (6 days ago)
- APK size
- 111 MB
- Requires
- Android 10+ (API 29)
- CPU support
- ARM 32-bit, ARM 64-bit
- Graphics
- OpenGL ES 3.0+
- Category
- Educational (game)
- Listed since
- Apr 6, 2026 (at least)
- Permissions
- 17 (2 sensitive)
- Website
- goukakuappli.co.jp
- Developer contact
- [email protected]
About this APK
Dual N-Back: Memory Training is a game by 合格アプリ in the Educational category, listed since at least April 2026. It includes native code for ARM 32-bit and ARM 64-bit, so it runs on practically every phone.
It asks for 17 permissions, 2 of them sensitive: read shared storage and modify shared storage. The game offers in-app purchases through Google Play and can read the advertising ID that ad and analytics services use.
What's new in v2.18.51
Description
From the listing uploaded by “superpocket”.
Security & authenticity
Signing certificate
- Certificate issued to “zph-mph” Not the developer's name (“合格アプリ”). Names in certificates can't be verified, so this alone proves nothing.
Store checks and file details
- Developer signature under review Oct 2, 2026
- Signed byCN=Jx Clarynx, O=zph-mph, OU=anon.org, L=Caraga, ST=Surigao Del Norte, C=8609
- Signing certificate (SHA-1)7D:64:F9:C2:53:C7:EF:35:A0:72:0F:6F:8A:80:2B:D4:B9:20:AA:3A
- File MD5a48f45e84d8513c1c55bcff7f353e8f2
- Uploaded by “superpocket” Silver tier · 5,272 followers · uploading since 2016
Scans and ratings come from the source store; the certificate comparisons are AAPKs's own, made from the files' published signatures. AAPKs doesn't scan files itself — compare the MD5 and signer after downloading.
Permissions (17)
Dual N-Back: Memory Training requests 17 permissions, 2 of them sensitive.
- Modify shared storage Sensitive android.permission.WRITE_EXTERNAL_STORAGE
- Read shared storage Sensitive android.permission.READ_EXTERNAL_STORAGE
- Access adservices ad id android.permission.ACCESS_ADSERVICES_AD_ID
- Access adservices attribution android.permission.ACCESS_ADSERVICES_ATTRIBUTION
- Access adservices topics android.permission.ACCESS_ADSERVICES_TOPICS
- Advertising ID com.google.android.gms.permission.AD_ID
- Full network access android.permission.INTERNET
- Google Play install referrer com.google.android.finsky.permission.BIND_GET_INSTALL_REFERRER_SERVICE
- In-app purchases (Google Play Billing) com.android.vending.BILLING
- Internal broadcast protection (app-defined) com.goukaku.nback.DYNAMIC_RECEIVER_NOT_EXPORTED_PERMISSION
- Prevent the device from sleeping android.permission.WAKE_LOCK
- Push messaging (app-defined) com.goukaku.nback.permission.C2D_MESSAGE
- Read Google service settings com.google.android.providers.gsf.permission.READ_GSERVICES
- Receive push notifications com.google.android.c2dm.permission.RECEIVE
- Run foreground services android.permission.FOREGROUND_SERVICE
- Show notifications android.permission.POST_NOTIFICATIONS
- View network connections android.permission.ACCESS_NETWORK_STATE
Dual N-Back: Memory Training APK: questions and answers
Can I install this APK over the version I already have?
Only if it is signed with the same certificate as the copy on your phone and isn't an older version. If Android says “App not installed”, the certificates differ; uninstalling your copy first works but deletes its data unless it is backed up.
Is Dual N-Back: Memory Training free?
The APK is free to download, but the game offers in-app purchases through Google Play.
Is the Dual N-Back: Memory Training APK safe?
No one can promise that a file is safe, but some things can be checked. The source store rates this file Trusted. After downloading, check that the file's MD5 is a48f45e84d8513c1c55bcff7f353e8f2.