Password Reminder (Solution)
by Amos Eshel
Each puzzle piece has the numbers 1 through N on it, where N is the length of the answer to that puzzle. Put the first letter of the answer in the box with a 1, second letter in the box with a 2, etc. Then assemble the puzzle pieces into the shape on the meta page (the one with the yellow squares), allowing puzzle pieces to overlap only where the squares have the same letter.
Below is the filled-out grid. Green squares are the overlaps of the puzzle pieces. Reading the spots with the yellow squares gives the meta's answer: WON TOO FOR ATE (a play on ONE TWO FOUR EIGHT).