Super Mario Bros World 4-2

The level is set above ground and underground. The clock starts at 400 seconds. There are 13 enemies placed on the map: 6 Koopa Troopas, 4 Buzzy Beetles and 3 Goombas. There are 42 coins lying in the open or hidden in blocks. Power-ups: 4 Super Mushrooms and 1 Starman.

Warp Zone. This level contains a Warp Zone with pipes to Worlds 5-1, 6-1, 7-1 and 8-1. It is the fastest legal way to skip ahead in the game.

Hidden vine. One brick in this level hides a vine. Hit it from below and climb to a bonus area above the clouds.

Pipes you can enter. One of the pipes can be entered by pressing down on top of it. The other 10 are decoration or obstacles.

Every number above is read straight out of the game files this site runs on, so the map you play here is the map being described.