Yellow jellies love each other. They love each other so much that all they want to do is come together and form huge yellow jellies. The blue jellies are yellow jellies friends, but their DNA doesn't match up, so they can't become one with the yellow jellies. That's why you have to use the blue jellies to help the yellow jellies become one. With as few shots as possible, use the mouse to aim the cannon and fire at the yellow jellies to join them together. The farther the reticle is from the cannon, the more powerful the shot will be.