"Addition Flash Cards" is an educational app designed for iPhone users, developed by Horizon Business Inc. It offers a unique blend of math flash cards and hangman game elements. In this app, users are challenged to solve math problems within a set time limit while avoiding mistakes to prevent the hangman from appearing.

Users can customize their learning experience by adjusting settings such as difficulty level, number of problems, hangman timer value, and choosing multiple-choice options in the "Settings" screen. With "Addition Flash Cards," practicing addition becomes an engaging and interactive task, adding a fun twist to traditional learning methods.