Have you been concerned about your memory lately, finding yourself recognizing faces but unable to recall names? You may be able to solve that problem by drilling your "working memory." "Working memory" refers to the structures and processes that temporarily record things in the brain and process information. It's like the notepad in your brain. According to recent research, the working memory can be improved through training. Raise the level of your working memory during your commute or your free time.

-- App outline --

Once you start the game, a series of simple arithmetic problems will appear one after another. You do not enter the answer to the currently displayed question, but instead answer the question displayed several questions ago. How many questions later you must answer the question depends on the game level.
(Easy = 1 question ago, Normal = 2 questions ago, Hard = 3 questions ago)