Gargantuan Grotto

Gargantuan Grotto, also known as , is the seventh level of World Star in Super Mario 3D World. It is unlocked after completing Honeycomb Starway, and its own completion unlocks Peepa's Fog Bog.

Layout
The level starts off in a jungle area with two Goomba Towers. Next is a hill the player can slide down with more Goomba Towers. Then, there are two more very tall Goomba Towers, one of which has a 1-Up Mushroom on its head, followed by a ? Block with a Mega Mushroom. There are two Big Galoombas and sets of Big Blocks which the player must destroy. Next is a set of Big Blocks in the air that contains a stamp. Below this are two panels of Big Blocks that must be destroyed by Mega Mario to progress. In the next area, there is a Hidden Block with a Super Leaf and a set of Mini Goombas. There is a wall made of Blurkers that the player must destroy to reach the first Green Star. After this is the Checkpoint Flag and a body of water. The player finds several Bloopers and spike boxes with water currents under them. In the middle is an area where the player can surface for a Mega Mushroom. After more spike boxes, the player must break through a set of Big Blocks to reach the next area. Immediately above this is another set with the second Green Star above it. Above the Green Pipe is a hidden bonus area where the player must collect all Blue Coins to get the third Green Star. Through the pipe is the area with the Goal Pole.

Green Stars

 * Green Star 1: After the stamp, the first Green Star is behind a wall of Blurkers.
 * Green Star 2: In the area with the second Mega Mushroom, the player must use the mushroom trampolines to break through two layers of Big Blocks. The Green Star is beyond the second wall.
 * Green Star 3: Inside a bonus area, which is located above the pipe leading out of the underwater section. The player needs to use a Mega Mushroom to collect all the Blue Coins and reveal the Green Star.

Stamp

 * At the start of the level, enclosed in some Mega Blocks. A Mega Mushroom is required to reach this Stamp.

Enemies

 * Goomba Towers
 * Goombas
 * Big Galoombas
 * Mini Goombas
 * Blurkers
 * Bloopers