This is the last level of World 5.
The level begins near Podoboos jumping out of the lava, along with two ? Blocks, one of which contains a power-up. A round, spinning fence can be found, followed by a few more fences over the lava and Podoboos. Green magic projectiles from Iggy begin to attack from off-screen. Above the fourth fence, a ? Block containing a Propeller Mushroom is found. A section with more Podoboos follows, along with another fence. A Dry Bones is found, along with a section of fences that raise and lower above the lava. Spinning fences with bars that act as solid platforms are found, along with a Red Ring. A Dry Bones is found, along with the midway point. Another section of fences that come out of the lava is found. Two more spinning fences are found, along with a ? Block containing a Propeller Mushroom. White-Green Checkered Blocks allow the player to reach the boss door.
The boss battle has Iggy with his pet Chain Chomp, which grows after being assisted by Kamek. It drags him around the room in a rectangle path, and Iggy, who is riding in a seat attached to the Chain Chomp's chain, occasionally shoots spells. There is a platform in the middle of the stage with two Donut Blocks, and six Jump Blocks, three on each side of the room. When Iggy is attacked, the Chain Chomp glows red and jumps in random directions. When beaten, Iggy and his Chain Chomp fall off screen and Mario progresses to World 6.
- Star Coin 1: The first Star Coin is floating right above the lava between two walls. Mario and co. can obtain it either by falling to it and using a Propeller Mushroom to fly away before touching the lava, or with a well-timed wall kick.
- Star Coin 2: Shortly after the first Star Coin, there is a grate wheel. Mario and co. must grab onto it and climb upwards on the left side to reach a hidden area with a Warp Door, which leads to an area with six Podoboos and the second Star Coin which is floating above a grate platform. Mario and co. must avoid the Podoboos, grab onto the grate, climb to the top, and finally jump to the Star Coin.
- Star Coin 3: Shortly after the midway point is a row of grate platforms with the third Star Coin to the immediate left of the last one. Mario and co. must climb to the top of either the last grate platform or the one to the left of it while at its top-most point and jump to get the Star Coin.