This is a Longplay of all Cups in Mario Kart DS in 150cc for the Nintendo DS played by me.
I play through the all the cups perfectly, always achieving all possible points and 1st Place with ★★★ Rank
I switch the Character and Kart every other Cup, allowing me to showcase all characters.
I do so to show all of them and have as much variety as possible in this Walkthrough.

Mario Kart DS (2005)
[Nintendo DS] / Nintendo Wii U
Playing through all Cups in 150cc
Perfect Scores / ★★★ Rank
Upper Screen - 4:3 Aspect Ratio
4K (UHD) [2880p x 2160p] 60fps
Lower Screen - 4:3 Aspect Ratio
720p (HD) [960p x 720p] 60fps

Timestamps:

1. 0:00:00 - 150cc | Mushroom Cup
Waluigi | Zipper
2. 0:09:55 - 150cc | Flower Cup
Dry Bones | Dry Bomber
3. 21:28 - 150cc | Star Cup
Daisy | Light Dancer
4. 33:31 - 150cc | Special Cup
Bowser | Hurricane
5. 46:07 - 150cc | Shell Cup
Wario | Dragonfly
6. 54:28 - 150cc | Banana Cup
Donkey Kong | Wildlife
7. 1:04:10 - 150cc | Leaf Cup
Toad | 4-Wheel Cradle
8. 1:14:17 - 150cc | Lightning Cup
Yoshi | Cucumber