Chroma Tundra

Chroma Tundra is an unused stage found on the Fourth Floor. It is infamous for it's precise platforming and obstructive blizzard, which makes it harder to see and pushes you around. The stage makes heavy use of the Metal Cap, oddly referred to as the Ice Cap by the textboxes in this stage. Chroma Tundra was most likely unused because it appears on the Fourth Floor, but probably would've went unused anyway because of the sheer difficulty and surprisingly dark parts.

Geography
Chroma Tundra is a tundra with many freezing lakes that act like lava, contributing to the heavy use of the Metal Cap. The most notable areas are an igloo village inhabited by toads, a citadel in a freezing lake owned by Bowser, and a place known as the Blizzard-Lands, an area where there are many hills and the blizzard is stronger than usual. The starting area is an island in a small freezing lake, which requires use of the nearby Metal Cap to escape the island without taking damage.

Missions

 * 1) 8 RED COINS HIDDEN IN THE BLIZZARD
 * 2) TUSSLE WITH PRINCE FROSTBITE
 * 3) BELLE IN THE BLIZZARD LANDS
 * 4) ASCEND BOWSER'S FROZEN CITADEL
 * 5) CAPSIZED!
 * 6) KOOPA THE QUICK IN THE UNBEARABLE BLIZZARD
 * 7) 100 COIN STAR

8 Red Coins Hidden in the Blizzard
After getting away from the starting island, there will be another, larger freezing lake. There will be some very thin platforms needed to get to the other side. It won't take too long to get across, but it will be difficult because of the blizzard pushing you. It is recommended to use the Metal Cap. At the other side is the igloo village, where the toads are rather bleak. They mention how things were better before Bowser trapped them in Chroma Tundra. Also frequently mentioned is the Blizzard-Lands, which they will give directions to. In the Blizzard-Lands, there are the red coins and the red coin star.

Tussle with Prince Frostbite
This star takes place in Bowser's Frozen Citadel. To get to the citadel, you must jump across several large stone blocks (with platforms on them) in a freezing lake, like the one you see in the picture. Inside the citadel, there will be a first particularly large room with some unlit torches, a few locked doors, and an ice golem. He is Prince Frostbite and says he is the guardian of the citadel. Then, he threatens to remove any unwelcome guests. A boss fight against him begins when the textbox closes. He attacks by jumping at you, and does damage on contact. Every three jumps he does a ground pound, sending out a shockwave that stuns on contact. To damge him, you must ground pound on the unlit torches, which will light it for a few seconds. If Prince Frostbite jumps into a lit torch three times, he is defeated. Although, sometimes you need to punch Prince Frostbite before the torches damage him. Unlike other bosses, he oddly doesn't say anything before releasing a star.

Belle in the Blizzard-Lands
When starting the mission, the music will sound more hectic. A textbox says that something has happened in the igloo village. Upon arrival, all of the locals will be distressed. They say a little toad girl, Belle, has gone missing in the Blizzard-Lands. The toads say she gave everyone hope because of her unrivaled optimism. When searching the Blizzard-Lands, you will eventually find Belle with a star. She says she is confident Mario will use the star to defeat Bowser and set the toads free, before giving the star. Upon collection, Mario silently looks to the sky, the camera moving with him. The game then transitions to Peach's Castle as normal. It is worth noting that in all later missions, the toads in the village can no longer be interacted with.

Ascend Bowser's Frozen Citadel
As the title suggests, collecting this star is achieved by climbing Bowser's Frozen Citadel. After getting inside, the middle door will be unlocked, and it opens to a tall tower with freezing water at the bottom. The walls will have rather small platfroms on them, which are necessary to get to the top. Once the exit is reached, there will be a star on the roof.

Capsized!
This star begins right where the last one left off, on top of Bowser's Frozen Citadel. (Although the previous star is missing) A textbox says that without the power of the star, the citadel will capsize. When the textbox closes, the building starts sinking and tilting, with the only safe way down being to slide on the wall of the citadel. There will be numerous enemies climbing the citadel, and they still do damage. Once at the bottom, the stone blocks in the lake will also capsize, and jumping across them is the only way to the other side. On the shore by the frozen lake, there is a star.

Koopa the Quick in the Unbearable Blizzard
Koopa the Quick will be in the Blizzard-Lands, where he offers to race back to the starting island. This race is known for being significantly harder than the other ones, partially because Koopa the Quick jumps in this mission, and he jumps far. He races across the thin platforms, and it is advised to use the Metal Cap when crossing the platforms. Oddly, if you use the Metal Cap, to cross the platforms, it will be fine, but if you use the Metal Cap to go across the freezing water, Koopa the Quick says using the "Ice Cap" is cheating and won't give you the star.

Reports
''Everything in this section should be taken with a grain of salt. These are unverified claims.''

Repot No. 1
"Funny, I vaguely remember this level from my cousin Sara's Game. I think there was this near-frozen little girl toad that you had to rescue from a blizzard, making tricky jumps as the wind wooshed wildly around the two of you...Yeah, I remember now, "Belle in the Blizzard-Lands" was the Star's name. I think in the end, she just couldn't go on, so she gave you the Star before it would freeze in her arms.... ...Then she faded away... This screenshot...I think that was from the "Ascend Bowser's Frozen Citadel" star... ...I believe that's where you found the toad-girl.  Boy, I remember Sara and I cried as the level ended. Mario didn't even do his twirl, he just looked up at the sky as the screen went to white."

"This screenshot is actually from the "capsized!" star, where you also need to climb the citadel because the ground is replaced with freezing water. The ice cap [Metal Cap] isn't available in the "Ascend Bowser's Frozen Citadel" star. Belle isn't present in this level at this point anymore."

"Oh yeah! Man! That Star was so difficult! That icy water rose so quickly, even the enemies went berserk as they tried scampering up for dear life! But they always got in the way! "

Report No. 2
"I remember one of the stars very faintly. It was around January of 1998 when this happened, I think. I had got the game for Christmas that previous month.Have you ever wondered why there are only two races with Koopa the Quick? That is because there are actually three. Bob-Omb Battlefield, Tiny Huge Island, and Chroma Tundra. And this third race was REALLY hard. Not only did you need the Ice Cap [Metal Cap] to even get through the level (and that was already hard enough to get), but you had to find KtQ. I don't remember where he was hiding, but I remember it was hard to find him with the fog. But don't even get me started on the race. Once it starts, you race him back to where you start in the stage. The hard thing is that he jumps every corner he can to save that little extra time. The race overall took around 30 to 35 seconds for him to reach the end. On average, 7 year old me got there in around 45-ish seconds? I never beat it to say the least. The star I believe was called something like "Koopa the Quick in the Unbearable Blizzard"."

Report No. 3
"I remember a ice golem boss in this course..I think is was called: Tussle with the Ice Golem. You needed to make these flamers turn on to damage the boss."

Report No. 4
"Oh man, this sub-area. This is where most memories of Chroma Tundra remain for me. Aide from the creepy atmosphere, this section didn't really have anything of note, yet it is still stuck vividly in my head for whatever reason. Lucas said something about an Ice Golem in this area? Yeah, that's right. I don't think he got the details of the fight correct though. When you found him, he would give a short monologue before bouncing off of his throne and starting the fight. You would have to punch him a couple of times before you could do actual damage. Once you break the ice, you would have to jump onto one of the unlit torches in the arena and ground pound it. This would give you a short amount of time to hop off of the torch. Once the Ice Golem jumps on the torch, he would take damage. This repeats two more times before you get the star. Lucas was pretty close with the star name, however he got the actual boss's name wrong. The star is actually called "Tussle with Prince Frostbite"."