Sub-Tree is the first section of The Great Cave Offensive, and the area where Kirby initially falls into (and eventually climbs back out from). As the name implies, the area is an underground forest, with lots of trees and foliage. The Boss of Sub-Tree is Fatty Whale, and a Mine Cart ride leads to Crystal from this stage. There are 13 Treasures in this area.
The initial hallway has no treasures in it, but it is lined with a number of small stone steps and is very distinctive. Kirby will eventually find his way back here after clearing through the entirety of the cave, where a Warp Star will be waiting to take him back out again. A door can be found to the right which will lead into the first proper room of Sub-Tree.
The first room is a jungle-like walkway, where Knuckle Joe will be the first to greet our pink spelunker. There are several enemies and side-chambers to be discovered here, most of which hold treasure of some sort. There are three treasures here.
The second room is a more narrow and elaborate tunnel, with a few branches and off-shoots. There are two treasures here.
The third room is a more elaborate series of tunnels with magma in some. Kirby will have to watch where he steps. Along the way, a Save Room can be found. There are four treasures here.
The fourth room is a segmented jungle area. Bonkers is encountered here, though he can be defeated easily by breaking the floor out from under him. This area is split into several smaller chambers, accessible by ladder. There are two treasures here.
The fifth room is a more open jungle area, with lots of foes inside and a bottomless pit below. Some String Platforms can be found here, which need to be cut to access certain areas. There are two treasures here.
From here, the boss room awaits (details in the Boss section below).
|Sub-Tree Area Treasures|
|Treasure||Image||Value||How to reach|
|Gold Medal||10,000 G||This treasure is out in the open in the first main room.|
|Gold Coin||1,000 G||This treasure is inside a side-chamber from the first room guarded by two Lovelies. It can be found in a water pit.|
|Whip||6,800 G||This treasure is in a small grotto under the main path in the first room. Kirby has to break some (but not all) Bomb Blocks top open the way.|
|Crystal Ball||200,000 G||This treasure can be found past a series of Gates in the second room, which Kirby has to open by pressing switches, then running through before they close.|
|Lucky Cat||500 G||This treasure can be found in a small chamber above the waterway in the second room.|
|Seiryu Sword||142,000 G||This treasure can be found above the magma chamber at the beginning of the third room. Kirby has to make sure it doesn't land in the magma, or it will be destroyed (but he can get it again if he leaves and comes back).|
|Screw Ball (Kirby Super Star)||80,000 G||This treasure can be found beneath a Bomb Block barrier in the floor in a small grotto in the third room.|
|Screw Attack (Kirby Super Star Ultra)|
|Echigo Candy||8,000 G||This treasure can be found in the ceiling, behind some breakable blocks in the third room.|
|Zebra Mask (Kirby Super Star)||278,000 G||This treasure is in a long cave in the floor through some water from the third room. Barriers will have to be broken from the outside to clear the way.|
|Phanto Mask (Kirby Super Star Ultra)|
|Star Stone||82,100 G||This treasure can be found in the top-left corner of the fourth room, in a small chamber accessible by a Cannon.|
|Beast's Fang||7,300 G||This treasure can be found in the lower-right of the fourth room, in a small chamber that has two Gordos buzzing around inside.|
|Bandanna||1.990 G||This treasure can be found in the middle of the fifth room, held up by three Bomb Block barriers. All three need to be removed to access it.|
|Springtime (Kirby Super Star)||250,000 G||This treasure can be found in a grotto under the main path of the fifth room, accessible by cutting a string platform.|
|Seasons Heart (Kirby Super Star Ultra)|
Enemies, mid-boss, and boss
Boss: Fatty Whale
In the main chamber, Kirby fights the giant whale boss from a bridge spanning over the water. Fatty Whale mainly uses its girth to attack, causing giant waves to carry Kirby off whenever it jumps, and making rocks fall from the ceiling. Defeating it clears the way forward to the first Mine Cart ride, then to the next area, Crystal.