Linear
Linear is the third level of day 14 and the 42nd level overall in Bloons Festive Fun.
Solution
Aim a low powered dart with the arrow touching the bottom of the leftmost bloon of the diagonal formation of Ice Bloons so that all Ice Bloons are popped, then aim two fully powered darts in a way that pops all the bloons in the horizontal formation. Finally, aim a fully powered dart directly down, with the arrow between the two columns of bloons, and pop all the Ice Bloons, which completes the level if done correctly.