The Type column shows the part of the site the puzzle is published in, its type and its size. Your current play state is also shown if you are logged in. Puzzles that can be opened for play or viewing are shown with bold text in the first column; those that are unplayable are shown with grey text in the first column. Click a puzzle icon or a green play sign to open a puzzle for play or viewing.
The Puzzle column shows the puzzle name and lets you click through to view the comments on this puzzle, as well as post comments of your own (you will need to log in to do this).