The 2x2 black square near the middle of this puzzle's grid, e.g., which is part of eight answers

Question:

Answer:

BLOCK

Length:

Similar Crossword Questions:

Subject of an annual March 14 celebration and of this puzzle, celebrated in both a literal and a numerical way in the first square of the starred answers, reading left to right
Number of times this puzzle's theme word appears diagonally in the grid (to complete the puzzle, shade those words plus the Down answers that begin where they meet)
Like aleph in the central black squares of this puzzle's grid
Black Friday destination found in nine of this puzzle's Across answers
Octet of black squares in the middle of this grid, typographically
Row of black squares preceding or following six puzzle answers, thereby completing them
1967 Box Tops hit about part of a puzzle answer grid?
A type of one appears in each part of this puzzle's longest answers
Angle irons graphically represented by four sets of black squares in this grid, and by letter formations starting in the four longest answers
Game that can follow the first part of this puzzle's four longest answers
"Hmmmmm ..." [as hinted at by the three groups of black squares in the middle of the grid]
New element whose name will be ratified in January, 2010, and whose symbol appears in the middle of this puzzle's theme answers
Web concerns ... and based on six familiar names hidden in rows 1, 4, 12 and 15 of this puzzle grid, what the black squares in those rows symbolize
On hold ... or what the seven rows of black squares in this puzzle's grid spell in Morse code
Worries, and word anagrammed in part of four puzzle answers
Last letter in most plurals (but not in this puzzle's six longest answers, which are the only plurals in this grid)
Cryptographers' successes (and what can be found in the circles in this puzzle's long answers)
Something associated with the first words of this puzzle's seven longest answers
Shoe additions, and what this puzzle's theme answers contain
Battleship call near the middle edge of the grid
Former UN leader HammarskjÃ¶ld [Note: The circled letters comprise a three-word instruction that, when applied to one square in the completed grid, reveals a group who might follow a code of silence]
Newsstand buy, for shortÂ—one begins each of the four longest puzzle answers (and also ends the last one)
Puzzle theme, part 3
Role model hidden in this puzzle's longest answers
Business term found in eight long puzzle answers