Jump to the platforms ahead of you to reach the ice block ahead. Be very careful, because some of them rotate and others collapse. Kill the dog and jump to the next platforms. These are very small and you cannot hang to them. On a block of ice you will find a box containing crystals. Continue by jumping on the platforms and being careful not to fall. You will come to a larger ice sheet. Kill the dog and get the crystals. From here on, it's easier to continue. You will have to jump on moving platforms to reach another ice block with crystals and finally the door. Next to the door you will find another box containing crystals. Enter the door to continue.
Here too, the path is very linear. Cross the ice bridge, collecting the crystals. You may be forced to jump, because the ice will cause you to slide back. On the other side, quickly kill the Dark Dantini, before it can attack you (or jump to avoid its attack). Continue by jumping on the elastic platforms to the left. You will find a chest containing crystals. Continue by jumping on the moving platforms to reach another chest. Be careful, because they move very fast. Then jump on the collapsing platform to reach another sheet of ice. Here is a Dark Dantini on a chest, which will shoot you as you jump. Avoiding its attack is not easy. Kill it and break the chest to get more crystals. From here you can then easily reach the door. Enter it.
Press the button on the left to make platforms appear above the frozen water pond. Thanks to these platforms you can easily reach a chest, where you will find an extra life. Then grab onto the monkey bars to reach the farthest area of this area, where you will find the puzzle piece. Grab it to complete the level.