New Super Mario Bros. is a side-scrolling video game. While it is seen in 2D, most of the characters and objects are 3D polygonalrenderings on 2D backgrounds, resulting in a 2.5D effect that visually simulates 3D computer graphics.[1][2] The player can play as either Mario, or his younger brother, Luigi. Similar to previous Mario games, Mario or Luigi can jump, crouch, collect coins, stomp on enemies, and break open blocks.[3][4] Moves from 3D Mario games reappear in New Super Mario Bros., including the ground pound, triple jump, and wall jump.[4] Enemies from previous games, such as Boos, are also reintroduced.[5]
Ten levels are available in each of eight worlds, which are shown in the Nintendo DS's bottom touchscreen while viewing the world map.[6][7] The map of the currently selected world appears in the top screen, which is used to navigate between the world's levels.[7] The goal of each level is to reach a black flag at the end of the level. At the end of each world, a boss must be defeated before proceeding to the next world.[6] There are six power-upsavailable in New Super Mario Bros.; the game allows the player to store an extra power-up when he is already using one, a feature carried over from Super Mario World. Three power-ups from Super Mario Bros. return: the Super Mushroom makes Mario grow in size, the Fire Flower lets Mario throw fireballs, and the Starman makes Mario temporarily invincible. Three more power-ups are introduced in New Super Mario Bros.: the Blue Koopa Shell lets Mario withdraw into a shell to protect himself and perform a "shell dash" attack. He also swims faster when in this form. The Mega Mushroom grows Mario to an incredible size, where he can destroy everything in his path, and the Mini-Mushroom causes Mario to shrink, allowing him to enter tiny passageways. Mini Mario is so light that he can run on water and jump extremely high.[6][8]