This app has been made especially for lazy people like me. It replaces screen locker, so every time you switch your smartphone on, you need to solve small quiz to unlock it. Also there's option to practise without switching screen lock on / off.
BTW, there is implemented TTS (Text To Speech) function, but to use it you will need to have 3rd party TTS engine. This function has been tested with SVOX TTS and DTalker Japanese TTS engines and it works perfectly. If you already have one touch word written in romanji to hear pronunciation.