This app is also very easy as well, it is called Shiori, basically, the user is given a topic like "Animal" and given a word beginning with "Monkey" like, they begin with y Animals that need to enter new words. This is done in Japanese, so if you think you can not find the material online, I can send a list of words and topics. Basically, there is a counter that counts the number of words entered by the user, and a timer that increments by 5 seconds when you enter a valid entry. The timer can be started in 2 minutes. If they reach seven words in a row, you need to change the word category to make it more difficult. Finally, add a leaderboard to allow users to add their name, save the score (number of words earned) and compare with other users. The winner gets a gift card.