Paper puzzle usually involving a 9x9 grid (2004)

Question:

Answer:

SUDOKU

Length:

Similar Crossword Questions:

Result of not following through (of which there are four examples in this puzzle's grid)
Set of which all seven elements are fittingly hidden in the solved puzzle grid
It's entirely represented in this puzzle grid
Descriptive of this puzzle's grid
Anti-abuse org. [To see the original color version of this puzzle's unusual grid, visit sundaycrosswords.com.]
Puzzle paper smudge
Pleased look (as depicted by this puzzle's grid)
1967 Box Tops hit about part of a puzzle answer grid?
Legend born 4/24/1942 whose name's 9 letters are the only ones in this puzzle grid
Number of F's in this puzzle's answer grid
Classic Belushi comedy, or an apt description of this puzzle's grid?
What you can find in the grid after completing this puzzle, looking up, down, left, right and diagonally, word search-style
Rectangular array that's identical when its rows and columns are transposed, as this puzzle's grid
Landmark inaugurated 3/31/1889 whose shape is suggested by nine squares in this puzzle's completed grid
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)
Word that may precede twelve words in this puzzle's grid
On hold ... or what the seven rows of black squares in this puzzle's grid spell in Morse code
Thing that may appear to be symmetrical but isn't ... like this puzzle's grid
Paper puzzle
2004 horror flick involving gory puzzles
Numerical puzzle with a 9x9 grid
Unlike this puzzle's grid
The 2x2 black square near the middle of this puzzle's grid, e.g., which is part of eight answers
Paper that reported the 2004 Madrid train bombings locally
God with a weekday named after him who can be found in this puzzle's three grid-spanning entries