It's the usual part 17, featuring our new enemy volunteer, Koopa Troopas! When you touch a Koopa, you lose a life. but when you bounce on it, they retreat themselves into their shells, so cool right? Koopa Troopas, commonly shortened to Koopas or Troopas, known in Japan as Nokonoko (ノコノコ), are reptilian mini-troopers of the Koopa Troop from the Mario franchise. They first appeared in the 1983 game Mario Bros. as Shellcreepers. The Koopa Troopas are among the oldest recurring enemies in the series and have appeared in some form in all of the main games and most of the spin-off games. When defeated, Koopas may flee from or retreat inside their shells, which can usually be used as weapons. Koopa shells are a recurring weapon in the series, particularly popularized in the Mario Kart series, in which they can be fired as projectiles against other racers. Despite making up the bulk of Bowser's army, known as the "Koopa Troop", Koopas as a species are often shown to be peaceful, some teaming up with Mario. A skeleton of a Koopa Troopa is a Dry Bones. Customize a level of your own, from a blank level to an interesting and wacky level of your own for Mario. Losing 5 lives means GAME OVER!!! 0 for the level editor 1 for the wooden tiles and pipes 2 for a bush, a cloud, and some black tiles 3 for the blue tiles and orange tiles 4 keys for coins and the Mario 5 keys for slopes 9 for the goomba, life mushroom, a star, and an end box with perks e for copying the same tile r for resetting, y for yes, n for no then write the width and height of your own l is for changing a level It's not mobile-friendly.