It turns out that the Grimace monster can take on a completely different form in order to achieve some goal, and in the game Rotating Grimace you will see this. Grimace turned into a purple ball only to collect the stars enclosed in the balloons. The round appearance is specifically used to make the hero roll faster towards the goals. You will turn the path in the form of a broken line and make sure that the monster does not jump out of it. And this is quite possible if he accelerates well in Rotating Grimace.
