UNITED, Inc. is the developer of ピラミッドの宝～ふしぎ暗算～ which can be found in the Educational category. The tool has been downloaded and installed by over 10K users and the most recent update is dated Jun 4, 2013. Google Play displays that this application is rated 3.9 by its users.
There are advertisements in the app. A free .apk installation package of ピラミッドの宝～ふしぎ暗算～ 1.12 can be downloaded from Droid Informer and you can read users' reviews on this site. Prepare 2 MB of free space on your device for this app setup package and keep in mind that it works fine on Android 2.1 and higher. The app was scanned for viruses and it was found 100% secure.