World 8-3 (New Super Mario Bros. Wii)
From the Super Mario Wiki
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The level starts out in a cavern full of lava. Throughout the level, Mario and company must contend with giant lava waves that defeat them upon contact. Hanging over the lava are chained platforms that sink when one of the characters step on them; these platforms can be found throughout most of the level's first half, with Koopa Troopas and Koopa Paratroopas placed on or around them. Shortly after the checkpoint is a series of tunnels that require the player to weave through incoming lava waves to pass safely. Following the tunnel is a series of weighted platforms that also sink if weight is applied to them. Flame Chomps are found in this area. At the end is a Warp Pipe that takes players to the level's Goal Pole.