World 1-5 (Super Mario Bros. 3)

World 1-5 is the sixth level of Grass Land in Super Mario Bros. 3 and the sixth level in the game overall. The level takes place in the underground tunnels with pools of water.

Layout
The level begins with Mario/Luigi sliding down a slope that leads into a cave. The player then slides into and kills (unless they jump before hitting them) 4 Buzzy Beetles. The slope then drops the player into a small pool of water with 5 coins over it. Immediately after this is an upward slope which leads to two Piranha Plants and a Buzzy Beetle. There are then two different paths; A top path, and a bottom path, both of which lead out of the cave and up to the surface of the cave, where there are 3 large slopes and multiple Green Koopa Troopas. The top path is rather short, quickly leading out of the underground section. However, it also has a hidden Pink Note Block in it that takes the player to Coin Heaven. The bottom path is much longer than the top path, having a large pool of water with 5 more coins in it followed by two small pockets of water and a smaller pool of water containing a ? Block with a Mushroom/Fire Flower inside it, before also leading up to the surface (albeit a bit farther down than the top path). After going forward some more, there is another tunnel that leads to a small area with multiple pipes, two of which have a Piranha Plant and a Venus Fire Trap, respectively. The last pipe is a Warp Pipe that leads to the end of the level.

Enemies

 * Buzzy Beetle
 * Piranha Plant
 * Venus Fire Trap
 * Koopa Troopa