The green cube traveled through the endless expanses of the universe and ended up in the maze of Maze Slider. The way out of it is active round portals. Once you reach them, you can go to a new level. A cube can easily fly from one object to another if it stands in the way of the flight. If there is nothing ahead, the hero will simply fly away into the unknown, and you will fail the passage of the level. Work out the route, and then start moving, clinging to the block supports and starting from them.