how many worlds are in new super mario bros

There are three dropdown menus, 'File', 'Student', and 'Lesson'. When the game starts, the player is taken to a main menu.

Most of the gameplay involves the player typing in a sequence of keys in correspondence to what the computer screen displays. This is Charles Martinet's first appearance in a video game as Mario, predating Super Mario 64 (which solidified him as the main voice actor of the character) by four years. In the CD-ROM Windows and Mac versions, a floating Mario head acts as a narrator and guide to the game, voiced by Charles Martinet. In said version, he is voiced by Ronald B. The MS-DOS version is the very first Super Mario video game in which Mario is heard speaking (though he previously could be heard grunting in Crazy Kong and spoke in Punch-Out!!). Mario Teaches Typing eventually spawned a sequel in 1996, Mario Teaches Typing 2. All of the game's music was sampled from Super Mario World. As the title suggests, Mario Teaches Typing was designed for improving a computer user's typing skills. It was later released on CD-ROM for Microsoft Windows and Macintosh in 1994. Mario Teaches Typing was originally released for MS-DOS in 1992, where the user could either use two 3'5' floppies or a single 5'75' one. It is one of the few licensed Super Mario computer titles. Mario Teaches Typing is a licensed edutainment game developed and published by Interplay Productions.

How many worlds are in new super mario bros