ONE Lettered QUIZ

This is an action quiz game where knowledge, reflexion, and insight may be refined. 
Try to fill answer with one by one letter among blocks moving on in various pattern.

Level is adjustable to change number of hint letters initially shown.
Category of question is variable in 14 types as easy question, trivia, language(English, French, Chinese, and Japanese), country group, and chemistry.
Original category can be generated by pasting text data.
Revenge list retains the recent 2 items played per category.
Upgrade with in-app-purchase enables expanding the level and revenge list as well as removing advertisements.

Start and experience the inspiration of one letter!