The puzzles are split into easier (left column) and harder (right column) puzzles. You can complete the puzzles in any order. Once you complete the puzzles, unscramble all the highlighted letters in the easier puzzles to get a two-word code. Repeat with the harder puzzles to get another two-word code. The solution from this puzzle is a concatenation of these two word codes into one four word code, the easy code before the hard code.