This application is a training tool to find wait tiles for Japanese Mahjong. Hands are dynamically generated based on random numbers rather than from a static list. As a result, there are countless types of hands you can challenge. You can change settings based on your mahjong skill level. The 4-tile mode is suitable for beginners. If you are experienced, try the 13-tile mode (i.e. Flush) and/or "no arrange tiles" mode. Push "Start" button when you finish settings. Click wait tiles when your hand is displayed and push "Submit" button. The next question is automatically displayed regardless of whether your answer is correct or incorrect, but it is also possible to change it to manual. There are five questions in a set by default, but you can change it in the settings if you like.