The Side A Pisces Riddle requirement is as follows -
"Squeezed between two spaceship bullets four times in "The World We Knew".
About 20% into this level, you'll be going upwards as ships will be firing bullets from the right to left, and the left to right. After 3 of these, there'll be ships shooting bullets downwards, meaning you can squeeze your player/head inbetween the two bullets fired from these ships. Squeeze inbetween 4, and pop.