The game world features coins scattered around for Mario to collect and special bricks marked with a question mark (?), which when hit from below by Mario may reveal more coins or a special item. Other "secret", often invisible, bricks may contain more coins or rare items. If the player gains a Super Mushroom, Mario grows to double his size and gains the ability to break bricks above him. If Mario gets hit in this mode, then instead of dying he turns back to regular Mario. :12 Players start with a certain number of lives and may gain additional lives by picking up green spotted orange 1-Up mushrooms hidden in bricks, or by collecting 100 coins, defeating several enemies in a row with a Koopa shell, or bouncing on enemies successively without touching the ground. Mario loses a life if he takes damage while small, falls in a bottomless pit, or runs out of time. The game ends when all lives are lost, although a button input can be used on the game over screen to continue from the first level of the world in which the player died.