Fears. Fears are what you encounter at the end of Ultra Speed Challenge 2.5++. Carl forces the Player Active to go through all of their worst fears, one by one. Each with their own boss phase.
Drowning

Drowning is the first fear the Player Active goes through.
You must make it to the end before running out of oxygen! Oh, and don't touch any spikey spikes. Rumor has it that they are spikey.
Spaghetti

Spaghetti is the second fear the Player Active goes through.
Paperust appears.... but wait.... it's not just Paperust.... it's Paperust 2!!
You must dodge his spaghetti based attacks until you defeat him!
Beanie Dog

Beanie Dog is the third fear the Player Active goes through.
Rapping Beanie Wearing Dog throws burritos at you, rides his skateboard, and throws punches/kicks out you. Owie... Scary..... spoikjdftgsagkljsdjgtg
The Night Watch

The Night Watch is the final fear the Player Active goes through.
You have to spend one night in a spooky office. All while the Red Active and Yellow Diamond attempt to get into your office! You must check the cameras and close the doors! To keep them out! All without using too much power!