Solution

This is an epic, so you should typically solve the other puzzles in the round first. Using each of the solutions from the other puzzles as an answer, you'll get back a new file as a hint. Each of the other puzzles can be related to an element. Using the image of the elements, and the hint "rotate methods clockwise", apply the method from "Blow my mind" (air) to "Make it rain" (water), and so on. The files contain the necessary data to do this. You'll end up with a second solution for each of the other puzzles, that will fit into the crossword. Some of the cells in the crossword are colored. Order these cells by the color/hue, and the letters from those cells will spell out "counter acidic", which is of course basic.