From the Super Mario Wiki
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The first part of the level features an L-shaped arena where Mario and co. must escort Spawny to proceed. There are two Lava Peek-a-Boos guarding the curve along with a Lava Supporter, and two Lava Valkyries guarding the safe zone shaded in yellow.
The second part of the level features a zigzag arena where Mario and co. must again escort Spawny to proceed. It features three Lava Peek-a-Boos and one Lava Supporter halfway through, and features three Lava Hoppers near the safe zone shaded in yellow.