Infinite Japanese is an iPhone application that aims to teach the most common words of Japanese through interactive games set in space. This game-first method of learning Japanese makes it easy and fun to learn the language without using English, just like a native.

The app allows you to gain mastery of words by being tested on the audio, text, and images individually. You can quicken your word recall by answering questions against the clock. The 30-second levels allow for learning no matter how much time you have. Moreover, you can customize your review by selecting words from any category to be tested on.

Overall, Infinite Japanese is a great app for anyone who wants to learn Japanese in a fun and interactive way. The app is free to use and is available on the App Store.