Lots of redlinks, I notice

"Red Bloons ahoy! The new lifelink technology has been stolen by Apopalypse Bloon and he has now inputted it into Red Bloons! They will be much more dangerous! The good side is that every bloon has been converted into Red Bloons! Wait, maybe that's bad... Face 100 rouns of PURE MADNESS!"

- Official description

Lots of redlinks, I notice is a special mission where every round only spawns RED BLOONS! It has normal rounds, and the red bloons that appear are equal to the supposed RBE of that round! But there's MORE! When bloons spawn, there is a chance (equal to the number of the current round) of a red bloon to get a reddish shield and make a redlink to another bloon, making that bloon have a shield with 1 AD and 5 HP too!