Mario Zone Area 4
From the Super Mario Wiki
The level starts off with a few steps leading to a Guruguri under a ? Block containing a Mushroom or Fire Flower. This is followed by another Guruguri and a Turtle Cannon. After another Guruguri, some Spike Traps will be laid across the floor. This will then lead to a small section with Turtle Cannons. Past this is a set of stairs with a Goomba on top. Under these stairs is a small path leading to bonus room containing many coins and Guruguri. If the player were to go up the stairs, they would find a few more Goombas followed by a group of four ? Blocks. The second-to-right ? Block contains a Mushroom or Fire Flower. After this is a Bomubomu with a Turtle Cannon, which is then followed by the Mid-Point Bell over another Bomubomu and Goomba. Past this is a platform inhabited by Wakiri, followed by a ? Block containing a Mushroom or Fire Flower along with another platform with Wakiri and a Moneybag under the second platform. After this are a few Wakiri, Guruguri and Goombas follower by the ending Warp Pipe leading to the Three Little Pigs boss-fight.