In the standard form of this puzzle type, you get a grid with three letters in each square, with clues for words to be eliminated, one letter per box, in a row or column for you to determine, with the remaining letters (one per box) spelling a message.
Puzzles
MIT Mystery Hunt 1994 3
MIT Mystery Hunt 1995 35: Library
MIT Mystery Hunt 2001 Another Dimension (Round 4 Meta)
Categories