World 6-4 is the thirty-first level of Super Mario 3D Land.
The level begins with Mario crossing a pair of beat block sets. After passing a couple of Prongos and Wallops, Mario finds a door leading to the inside of the level. The inside features several more beat blocks. Once Mario makes his way to the exit of this inside portion, he finds the Checkpoint of the level. There are several more beat blocks that lie past the checkpoint, found in arrangements of climbing, running, and very clever jumping. After a winding path around two large spiked bars, Mario finds himself near a wall. This last area sports more spiked bars the rock in a "u" formation. Past these final beat blocks, Mario makes his way to the Flagpole.
Enemies that appeared in World 6-4:
- Star Medal 1: The first Star Medal is found atop the entrance to the inside portion of the level.
- Star Medal 2: Like the first one, the second Star Medal is found atop the exit of the inside portion of the level.
- Star Medal 3: The third Star Medal is found on the block of the first spinner with spiked balls.