九九チャレ - かけ算の学習をおうえんします is an educational app developed by HAPPYCODE INC for Android devices. The app offers various features to help children learn multiplication tables in a fun and interactive way.

The app consists of different courses that cater to different learning needs. In the まなびコース (Learning Course), children can listen to examples of how to read multiplication tables while learning them. In the ちょうせんコース (Challenge Course), children can solve various multiplication problems, including ordering, random, missing factors, and word problems.

For those looking for an extra challenge, the パワーアップコース (Power-Up Course) offers random question sets and the ability to focus on previously missed problems. The app also offers a かけられる かず と かける かず (Factors and Multiples) feature to help children understand the relationship between factors and multiples.

In addition to the learning courses, the app provides hints in the form of illustrations and keeps track of the user's learning progress. It allows for up to 10 user profiles, each with their own learning records.

The まなびコース and ちょうせんコース are available for free, while the パワーアップコース and かけられる かず と かける かず features require in-app purchases.