From Wikipedia: Mario Teaches Typing is a video game designed to teach typing skills to children. It was published and developed by Interplay and officially licensed by Nintendo. It was released for MS-DOS in 1991, Microsoft Windows and Macintosh in 1995. Mario Teaches Typing includes three selectable characters: Mario, Luigi and Princess Toadstool. The game displays two pairs of hands which show which finger to use; for example, if the player has to type "A", the leftmost finger is highlighted. If the player makes an error, the cursor does not advance until they enter the correct key. After time ends, the exercise ends and a chalkboard screen appears, displaying statistics on how well the player performs.