These odd squiggly, blocks will serve as platforms that Link can jump onto. However, when Link draws near, the Jelly will start wiggling around like crazy, harming you if you try to jump on top of them. In order to jump on them, Link will first need to use the Boomerang to stun the jelly. This will turn the jelly purple in which they will appear as a regular platform for a short time. After several moments, they will re-animate, once again doing damage when Link is too close.